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• Packaging--1920-1950.
• Packaging--1930-1950.
• Page, Robert Morris,--1903---Homes & haunts.
• Paint industry--1920-1940.
• Paint industry--Washington (D.C.)--1920-1930.
• Paint industry--Washington (D.C.)--1930.
• Palladian windows--1800.
• Palladian windows--Washington (D.C.)--1910-1920.
• Palladian windows.
• Palm houses. (2)
• Palmedo, Philip F.--Homes & haunts--New York (State)--Saint James. (2)
• Palms.
• Pan American Sanitary Bureau--Buildings--Washington (D.C.)--1950-1960.
• Pan American Union Building (Washington, D.C.)--1900-1910.
• Pan American Union Building (Washington, D.C.)--1910-1920. (2)
• Panama-Pacific International Exposition--(1915 :--San Francisco, Calif.)
• Paneling--1840-1870.
• Paneling--1910-1920.
• Paneling--1930-1940. (2)
• Paneling--Maryland--Cambridge--1940-1950.
• Paneling--Maryland--Kensington--1940.
• Paneling--Massachusetts--Nantucket--1910-1960.
• Paneling--New Hampshire--Portsmouth--1920-1930.
• Paneling--Virginia--1920-1940.
• Paneling--Virginia--Richmond County--1930-1940.
• Paneling--Virginia--Richmond--1920-1930.
• Paneling--Virginia--Warrenton--1910-1940.
• Paneling--Virginia--Williamsburg--1920-1930.
• Paneling--Virginia--Williamsburg--1930-1940.
• Paneling--Washington (D.C.)--1900-1910. (2)
• Paneling--Washington (D.C.)--1910-1920. (6)
• Paneling--Washington (D.C.)--1910.
• Paneling--Washington (D.C.)--1920-1930. (7)
• Paneling--Washington (D.C.)--1930-1940.
• Paneling--Washington (D.C.)--1950-1960.
• Paneling.
• Pantheon (Paris, France)--1900-1910.
• Pantheon (Rome, Italy)
• Pantries--1920-1930.
• Pantries--Maryland--Chevy Chase--1910-1920.
• Pantries--Maryland--Montgomery County--1920-1930.
• Pantries--Washington (D.C.)--1910-1920.
• Pantries--Washington (D.C.)--1910-1930.
• Pantries--Washington (D.C.)--1910.
• Pantries--Washington (D.C.)--1920-1930. (2)
• Pantries--Washington (D.C.)--1930-1940.
• Parapets--1810-1840.
• Parapets--New York (State)--New York--1920-1930.
• Parapets--Spain--Palma de Mallorca--1920-1930.
• Parapets--Washington (D.C.)--1900-1920.
• Parapets--Washington (D.C.)--1910-1920. (2)
• Parapets--Washington (D.C.)--1920-1930.
• Parapets--Washington (D.C.)--1950-1960.
• Pardoe, C. H.--(Charles Harmon),--b. 1890--Homes & haunts--Washington (D.C.)
• Parish houses--1960-1970.
• Parish houses--Virginia--Alexandria--1940-1950.
• Parish houses--Virginia--McLean--1920-1930.
• Parker, Joseph O.,--1908---Homes & haunts--Virginia--Arlington.
• Parking garages--1960-1970.
• Parking garages--Maryland--Rockville--1970-1980.
• Parking garages--Maryland--Silver Spring--1960-1970.
• Parking garages--Virginia--1950-1960.
• Parking garages--Washington (D.C.)--1890-1950.
• Parking garages--Washington (D.C.)--1920-1930. (2)
• Parking garages--Washington (D.C.)--1930-1940. (4)
• Parking garages--Washington (D.C.)--1930.
• Parking garages--Washington (D.C.)--1950-1960.
• Parking garages--Washington (D.C.)--1960-1970. (2)
• Parking garages--Washington (D.C.)--1970-1980.
• Parking lots--1960-1970. (2)
• Parking lots--1970-1980.
• Parking lots--Maryland--Chevy Chase--1920-1930.
• Parking lots--Maryland--Glen Echo--1950-1960.
• Parking lots--Virginia--Falls Church--1940-1960.
• Parking lots--Virginia--Richmond--1940-1950.
• Parking lots--Washington (D.C.)--1930-1940. (2)
• Parking lots--Washington (D.C.)--1940-1950.
• Parking lots--Washington (D.C.)--1950-1960.
• Parking lots--Washington (D.C.)--1960.
• Parking lots--Washington (D.C.)--1970-1980.
• Parking lots--Washington (D.C.)--1970-1990.
• Parks--Washington (D.C.)--1960-1980.
• Parks--Washington (D.C.)--1970.
• Parks. (2)
• Parkways--Virginia--Mount Vernon--1930-1940.
• Parlors--Washington (D.C.)--1920-1930.
• Parlors.
• Partitions--1890-1940.
• Partitions--1910-1920. (2)
• Partitions--1920-1930.
• Partitions--1940-1950.
• Partitions--1960-1970.
• Partitions--1970.
• Partitions--New York (State)--New York--1920-1930.
• Partitions--Washington (D.C.)--1920-1930.
• Passageways--Maryland--Queen Anne's County--1940-1950.
• Passageways--Washington (D.C.)--1910-1930.
• Passageways--Washington (D.C.)--1960-1970.
• Passageways--Washington (D.C.)--1980-1990.
• Passageways--West Virginia--Charleston--1920-1930.
• Patents--1900-1930.
• Patios--1950-1960. (3)
• Patios--New Jersey--1950-1970.
• Patios--Washington (D.C.)--1900-1910.
• Patterson, Eleanor Medill,--1881-1948--Homes & haunts--Maryland--Upper Marlboro.
• pavilions (building divisions)
• Pavilions (Building divisions)--Maryland--Bethesda--1980-1990.
• Pavilions (Building divisions)--Washington (D.C.)--1930-1940.
• Pavilions (Facilities)--1950-1960.
• Pavilions--1910-1960.
• Pavilions--Arizona--Chandler--1920-1930.
• Pavilions--Maryland--Chevy Chase--1930-1940.
• Pavilions--Maryland--Glyndon--1980-1990.
• Pavilions--Virginia--King George County--1920-1960.
• Pavilions--Washington (D.C.)--1920-1930.
• Pavilions. (5)
• Peace. (2)
• Peacocks.
• Peary, Josephine Diebitsch--Homes & haunts--Washington (D.C.)
• Peary, Robert E.--(Robert Edwin),--1856-1920--Homes & haunts--Washington (D.C.)
• Pedestals--1880-1910.
• Pedestals--Washington (D.C.)--1920-1940.
• Pedestals.
• Pedestrian bridges--1950.
• Pedestrian bridges--Maryland--Rockville--1960-1970.
• Pedestrian bridges--Virginia--Belle Haven--1960-1970.
• Pedestrian bridges--Washington (D.C.)--1970-1980.
• Pedestrian malls--Washington (D.C.)--1950-1970.
• Pediments--Washington (D.C.)--1850-1860. (2)
• Pediments--Washington (D.C.)--1910-1920.
• Pediments--West Virginia--Charleston--1920-1930.
• Pelicans.
• Pennsylvania Central Airlines--Facilities--Washington (D.C.)--1930-1950.
• Pension Building (Washington, D.C.)--1880-1890.
• Pension Building (Washington, D.C.)--1920-1930.
• Pension Building (Washington, D.C.)--1930-1940.
• Pension Building (Washington, D.C.)--1970-1980.
• Penstocks--Washington (D.C.)--1930-1940.
• Pentagon (Va.)--1940-1950.
• Penthouses--Maryland--Bethesda--1970-1980.
• Penthouses--Washington (D.C.)--1900-1910.
• Penthouses--Washington (D.C.)--1910-1920.
• Penthouses--Washington (D.C.)--1920-1930. (2)
• Penthouses--Washington (D.C.)--1920-1940.
• Penthouses--Washington (D.C.)--1950-1960.
• Penthouses--Washington (D.C.)--1960-1970. (3)
• Penthouses--Washington (D.C.)--1980-1990. (3)
• Peoples Drug Stores, inc.--Buildings--Washington (D.C.)--1920-1930. (5)
• Pepsi-Cola Company--Buildings--Maryland--La Plata--1950-1960.
• Pepsi-Cola Company--Buildings--West Virginia--Charleston--1950-1960.
• Performing Arts Library (Washington, D.C.)--Facilities--1970-1980.
• Pergolas--Washington (D.C.)--1910-1930.
• Pergolas--Washington (D.C.)--1920-1930. (3)
• Pergolas--Washington (D.C.)--1920-1940.
• Pergolas. (8)
• Perspective--1810-1840.
• Perspective--1830-1860.
• Peter, Martha Parke Custis,--1777-1854--Homes & haunts--Washington (D.C.)
• Peter, Thomas,--1769-1834--Homes & haunts--Washington (D.C.)
• Petit Trianon (Versailles, France)--1900-1910.
• Pews--1960-1970. (2)
• Pews--Massachusetts--Boston--1830-1840.
• Pews--Virginia--Burkeville--1910-1920.
• Pews--Virginia--Greenwood--1910-1920.
• Pews--Washington (D.C.)--1920-1940.
• Phi Gamma Delta--Buildings--Wisconsin--Madison--1920-1930.
• Phillips, Thomas W.,--Jr.,--1874-1956,--Homes & haunts--Washington (D.C.)
• Phillips, Thomas W.,--Jr.,--1874-1956--Homes & haunts--Maryland--Wicimico. (2)
• Phillips, Thomas W.,--Jr.,--1874-1956--Homes & haunts--Maryland--Wicomico. (2)
• Philosophy--1850-1860.
• Photographic apparatus & supplies--1930-1940.
• Photographic studios--Washington (D.C.)--1920.
• Physical therapy--Washington (D.C.)--1930-1940.
• Picardo. (2)
• Pier tables--1830-1860.
• Pierce Mill (Washington, D.C.)--Buildings--1930-1940. (2)
• Piers & wharves--Washington (D.C.)--1970-1980.
• Piers & wharves. (2)
• Pilasters--Maryland--Chevy Chase--1900-1920.
• Pilasters--Maryland--Chevy Chase--1930-1940.
• Pilasters--Washington (D.C.)--1900-1930.
• Pilasters--Washington (D.C.)--1910-1920.
• Pilasters--Washington (D.C.)--1920-1930. (5)
• Pilasters--Washington (D.C.)--1920-1940.
• Pilasters--Washington (D.C.)--1930-1940.
• Pilasters--Washington (D.C.)--1980-1990.
• Pilasters--West Virginia--Jefferson County--1940-1950.
• pilings (civil engineering) (3)
• Pinchot Institute for Conservation Studies. (2)
• Pinchot, Gifford,--1865-1946--Homes & haunts--Washington (D.C.)
• Pipes--1830-1850.
• Pipes--New York (State)--New York--1840-1850.
• Pipes--Washington (D.C.)--1960.
• Pirates. (5)
• Pitchers--1850-1890.
• Pitchers.
• Plant containers--1910-1920.
• Plant containers--1960.
• Plant containers--Washington (D.C.)--1910-1950.
• Plantations. (2)
• Plants--1950.
• Plants--Virginia--Fairfax County--1960-1970.
• Plants--Virginia--Hollin Hills--1940-1950.
• Plants--Virginia--Hollin Hills--1950-1960. (10)
• Plants--Virginia--Hollin Hills--1950. (3)
• Plants--Virginia--Hollin Hills--19501960.
• Plants. (3)
• Plaques--1920-1930.
• Plaques--1960-1970. (2)
• Plaques--Panama--Paraiso (Ancon)--1910-1920.
• Plaques--Virginia--Greenwood--1910-1920.
• Plaques--Washington (D.C.)--1920-1930. (3)
• Plaques--Washington (D.C.)--1930-1940. (2)
• Plasterwork--1920-1930.
• Plasterwork--Maryland--Chevy Chase--1910-1920. (4)
• Plasterwork--Maryland--Silver Spring--1920-1950.
• Plasterwork--Virginia--Williamsburg--1930-1940.
• Plasterwork--Washington (D.C.)--1900-1910.
• Plasterwork--Washington (D.C.)--1910-1920. (9)
• Plasterwork--Washington (D.C.)--1910.
• Plasterwork--Washington (D.C.)--1920-1930. (8)
• Plates (Tableware)--New York (State)--New York--1920-1930.
• Playgrounds--Washington (D.C.)--1910-1920.
• Playgrounds--Washington (D.C.)--1960-1970.
• Playrooms--Washington (D.C.)--1940-1950.
• Plazas--1960-1970. (2)
• Plazas--New York (State)--New York--1960-1970.
• Plazas--Washington (D.C.)--1980-1990. (2)
• Plazas. (3)
• Pleadwell, Theodosia Wallace--Homes & haunts--Washington (D.C.)
• Plows--1860-1870.
• Plumbing fixtures--Washington (D.C.)--1920-1930.
• Plumbing industry--Maryland--Baltimore--1920-1930.
• Plumbing industry--Washington (D.C.)--1920-1930.
• Pneumatic tubes--1930-1940.
• Pneumatic tubes--Washington (D.C.)--1910-1920.
• Pocket doors--Washington (D.C.)--1810-1820.
• Podiums--1960-1970.
• Podiums--Washington (D.C.)--1930-1940.
• Poetry.
• Police stations.
• Polychromy--Maryland--Silver Spring--1950-1960.
• Pools--1960-1970.
• Poor boxes--1940-1950.
• Pope, John,--1770-1845--Homes & haunts--Kentucky--Lexington.
• Porcelain enamel--1930-1940. (4)
• Porcelain enamel--1930-1950.
• Porcelain enamel--1930-1960. (7)
• Porcelain enamel--1930-1980.
• Porcelain enamel--1950-1960.
• Porcelain enamel--Maryland--1950-1960.
• Porcelain enamel--Maryland--1950-1970.
• Porcelain enamel--Maryland--Annapolis--1950-1960.
• Porcelain enamel--Maryland--Baltimore--1950-1960. (3)
• Porcelain enamel--Maryland--Bethesda--1960-1970.
• Porcelain enamel--Maryland--Cheverly--1950-1970.
• Porcelain enamel--Maryland--Chevy Chase--1950-1960.
• Porcelain enamel--Maryland--Frederick--1930-1940.
• Porcelain enamel--Maryland--Frederick--1940-1950.
• Porcelain enamel--Maryland--Frederick--1950.
• Porcelain enamel--Maryland--Hyattsville--1930-1960. (2)
• Porcelain enamel--Maryland--La Plata--1950-1970.
• Porcelain enamel--Maryland--Silver Spring--1930-1940.
• Porcelain enamel--Maryland--Silver Spring--1930-1960. (2)
• Porcelain enamel--Maryland--Wheaton--1950-1960. (3)
• Porcelain enamel--Pennsylvania--Philadelphia--1930-1960.
• Porcelain enamel--Pennsylvania--Philadelphia--1940.
• Porcelain enamel--Virginia--1950-1960.
• Porcelain enamel--Virginia--1950-1970.
• Porcelain enamel--Virginia--Alexandria--1930-1940.
• Porcelain enamel--Virginia--Alexandria--1930-1960.
• Porcelain enamel--Virginia--Alexandria--1950-1960.
• Porcelain enamel--Virginia--Alexandria--1950-1970.
• Porcelain enamel--Virginia--Alexandria--1960.
• Porcelain enamel--Virginia--Arlington--1930-1940.
• Porcelain enamel--Virginia--Arlington--1930-1960.
• Porcelain enamel--Virginia--Rosslyn--1940.
• Porcelain enamel--Virginia--Winchester--1940-1950. (2)
• Porcelain enamel--Washington (D.C)--1950-1970.
• Porcelain enamel--Washington (D.C.)--1930-1940. (2)
• Porcelain enamel--Washington (D.C.)--1930-1960. (13)
• Porcelain enamel--Washington (D.C.)--1930-1980.
• Porcelain enamel--Washington (D.C.)--1940-1950. (2)
• Porcelain enamel--Washington (D.C.)--1950-1960. (5)
• Porcelain enamel--Washington (D.C.)--1950-1970.
• Porcelain enamel--Washington (D.C.)--1960-1970.
• Porcelain enamel--Washington Metropolitan Area--1930-1960. (2)
• Porcelain enamel--West Virginia--Martinsburg--1940-1950.
• Porches--1840-1860.
• Porches--1910-1960.
• Porches--1920-1930.
• Porches--1960-1970.
• Porches--Maryland--Bethesda--1910-1920.
• Porches--Maryland--Bethesda--1920-1930.
• Porches--Maryland--Bethesda--1940-1950.
• Porches--Maryland--Cambridge--1940-1950. (3)
• Porches--Maryland--Chevy Chase--1910-1920.
• Porches--Maryland--Chevy Chase--1920-1930. (3)
• Porches--Maryland--Chevy Chase--1920.
• Porches--Maryland--Chevy Chase--1930-1940. (2)
• Porches--Maryland--Chevy Chase--1930.
• Porches--Maryland--Glen Echo Heights--1950-1960.
• Porches--Maryland--Greenbelt--1930-1940.
• Porches--Maryland--Kensington--1940.
• Porches--Maryland--Leonardtown--1930-1940.
• Porches--Maryland--Montgomery County--1920-1930.
• Porches--Maryland--Rockville--1930-1940.
• Porches--Maryland--Silver Spring--1910-1920.
• Porches--New Jersey--Plainfield--1920-1930.
• Porches--North Carolina--Edenton--1930-1940.
• Porches--Virginia--Alexandria--1910-1920.
• Porches--Virginia--Falls Church--1950-1960. (2)
• Porches--Virginia--Hot Springs--1920-1930.
• Porches--Virginia--Sperryville--1960-1980.
• Porches--Virginia--Williamsburg--1930-1940. (2)
• Porches--Washington (D.C.)--1900-1920.
• Porches--Washington (D.C.)--1910-1920. (8)
• Porches--Washington (D.C.)--1910-1930.
• Porches--Washington (D.C.)--1920-1930. (12)
• Porches--Washington (D.C.)--1920-1940.
• Porches--Washington (D.C.)--1930-1940. (3)
• Porches--Washington (D.C.)--1940-1950.
• Porches--Washington (D.C.)--1950-1960. (3)
• Porches--Washington (D.C.)--1950-1970.
• Porches--Washington (D.C.)--1960-1970. (2)
• Porches--West Virginia--Charles Town--1920-1930.
• Porches. (6)
• Porte cocheres--Virginia--Charlottesville--1920-1930.
• Porte cocheres--Washington (D.C.)--1910-1920.
• Porte cocheres--Washington (D.C.)--1920-1930. (2)
• Porte cocheres--Washington (D.C.)--1930.
• Porte cocheres.
• Porte-cocheres--Maryland--Catonsville--1920-1930.
• porticoes (porches)
• Porticoes (Porches)--New York--Garden City--1910-1920.
• Porticoes (Porches)--Washington (D.C.)--1920-1930.
• Porticoes (Porches)--Washington (D.C.)--1930-1940.
• Porticoes (Porches)--Washington (D.C.)--1950.
• Porticoes (Porches)--Washington (D.C.)--1960-1970.
• Post offices--1930-1940. (18)
• Post offices--1930-1980.
• Post offices--1940-1950.
• Post offices--Connecticut--Hartford--1860-1880.
• Post offices--Connecticut--New Haven--1850-1860.
• Post offices--Delaware--Wilmington--1850-1860.
• Post offices--Florida--Pensacola--1850-1860.
• Post offices--Illinois--Cairo--1860-1880.
• Post offices--Illinois--Chicago--1850-1860.
• Post offices--Illinois--Chicago--1860-1880.
• Post offices--Illinois--Galena--1850-1860.
• Post offices--Illinois--Springfield--1850-1860.
• Post offices--Illinois--Springfield--1860-1880.
• Post offices--Indiana--Indianapolis--1850-1860.
• Post offices--Iowa--Des Moines--1860-1870.
• Post offices--Iowa--Dubuque--1850-1860.
• Post offices--Maine--Bangor--1860-1880.
• Post offices--Maine--Bath--1850-1860.
• Post offices--Maine--Belfast--1850-1860.
• Post offices--Maine--Ellsworth--1850-1860.
• Post offices--Maine--Portland--1850-1860.
• Post offices--Maine--Portland--1850-1870.
• Post offices--Maine--Portland--1870-1880.
• Post offices--Maine--Waldoboro--1850-1860.
• Post offices--Maryland--Langley Park--1950-1960.
• Post offices--Massachusetts--Barnstable--1850-1860.
• Post offices--Massachusetts--Boston--1860-1880.
• Post offices--Massachusetts--Gloucester--1850-1860.
• Post offices--Michigan--Detroit--1850-1860.
• Post offices--Minnesota--Saint Paul--1860-1880.
• Post offices--Missouri--Saint Louis--1860-1880.
• Post offices--Nebraska--Omaha--1860-1880.
• Post offices--New Hampshire--Portsmouth--1850-1860.
• Post offices--New Jersey--Newark--1850-1860.
• Post offices--New Jersey--Trenton--1860-1880.
• Post offices--New York (State)--Buffalo--1850-1860.
• Post offices--New York (State)--New York--1860-1880.
• Post offices--New York (State)--Ogdenburg--1850-1860.
• Post offices--New York (State)--Ogdensburg--1860-1880.
• Post offices--New York (State)--Oswego--1850-1860.
• Post offices--New York (State)--Plattsburgh--1850-1860.
• Post offices--Ohio--Cincinnati--1850-1860.
• Post offices--Ohio--Cleveland--1850-1860.
• Post offices--Ohio--Sandusky--1850-1860.
• Post offices--Ohio--Toledo--1850-1860.
• Post offices--Oregon--Portland--1860-1880.
• Post offices--Pennsylvania--Philadelphia--1860-1880.
• Post offices--Rhode Island--Bristol (Town)--1850-1860.
• Post offices--Rhode Island--Providence--1850-1860.
• Post offices--South Carolina--Charleston--1800-1880.
• Post offices--Tennessee--Knoxville--1870-1880.
• Post offices--Tennessee--Memphis--1860-1880.
• Post offices--Vermont--Burlington--1850-1860.
• Post offices--Vermont--Rutland--1850-1860.
• Post offices--Vermont--Windsor--1850-1860.
• Post offices--Virginia--Petersburg--1850-1860.
• Post offices--Virginia--Richmond--1850-1860.
• Post offices--Washington (D.C.)--1790-1950.
• Post offices--Washington (D.C.)--1850-1860.
• Post offices--Washington (D.C.)--1860-1880.
• Post offices--Washington (D.C.)--1920-1930.
• Post offices--West Virginia--Wheeling--1850-1860.
• Post offices--Wisconsin--Madison--1860-1880.
• Post offices--Wisconsin--Milwaukee--1850-1860.
• Potomac Electric Power Company--Buildings--Washington (D.C.)--1920-1930. (6)
• Potomac Electric Power Company--Buildings--Washington (D.C.)--1920. (2)
• Potomac Electric Power Company--Buildings--Washington (D.C.)--1930-1940.
• Potomac River--1890-1900.
• Potomac River.
• Pots & pans--1950-1960. (3)
• Poultry houses--Maryland--Whiteford--1930.
• Poultry houses--Washington (D.C.)--1920.
• Power plants--Maryland--Frederick--1910-1920.
• Power plants--Maryland--Wicomico--1920-1930.
• Power plants--Washington (D.C.)--1900-1910.
• Power plants--Washington (D.C.)--1910-1920.
• Power plants--Washington (D.C.)--1910-1940.
• Power plants--Washington (D.C.)--1920-1930. (3)
• Power plants--Washington (D.C.)--1920. (2)
• Power plants--Washington (D.C.)--1930-1940.
• Prefabricated buildings--1910-1920. (6)
• Prefabricated buildings--1950-1960. (2)
• Prefabricated houses--1910-1920.
• Prefabricated houses--1940-1950.
• Prefabricated houses--1940. (4)
• Prefabricated houses--1950-1960.
• Presbyterian churches--Maryland--Takoma Park--1920-1930.
• Presbyterian churches--West Virginia--Charles Town--1900-1910.
• Presbyterian churches. (11)
• Presbyterian Home (Washington, D.C.)--Buildings--1920-1930.
• Presbyterian Home (Washington, D.C.)--Buildings--1930-1940.
• President's Council on Pennsylvania Avenue (U.S.)--People--1960-1970.
• Presidential elections--1960-1970.
• Presidents--United States.
• Prince George's County (Md.)--1920-1940.
• Prince William County (Va.)--1900-1910.
• Princeton University. (5)
• Printing industry--1910-1940.
• Printing industry--Washington (D.C.)--1910-1920. (2)
• Printing industry--Washington (D.C.)--1910-1930.
• Printing industry--Washington (D.C.)--1910-1950.
• Printing industry--Washington (D.C.)--1920-1930. (4)
• Printing industry--Washington (D.C.)--1920-1940.
• Printing industry--Washington (D.C.)--1930-1940. (3)
• Printing industry--Washington (D.C.)--1930. (2)
• Printing industry--Washington (D.C.)--1940-1950. (3)
• Printing industry--Washington (D.C.)--1940.
• Printing industry--Washington (D.C.)--1950-1960.
• Printing--1850-1860.
• Prior, L.--(Laurens)--Homes & haunts--Maryland--Chevy Chase
• Prior, L.--(Laurens)--Homes & haunts--Massachusetts--Chevy Chase
• Prisons. (2)
• Privies--West Virginia--1970.
• Privies.
• Protestant churches--Maryland--Chevy Chase--1920-1930.
• Protestant churches--Tennessee--Johnson City--1920-1930.
• Protestant churches--Virginia--Purcellville--1900-1940.
• Providence Hospital (Washington, D.C.)--Buildings--1940-1950.
• Providence Hospital (Washington, D.C.)--Buildings--Washington (D.C.)--1880-1950.
• Providence Hospital (Washington, D.C.)--Buildings--Washington (D.C.)--1910-1920.
• Public baths--West Virginia--1970.
• Public baths.
• Public housing--1950-1960. (2)
• Public Schools of the District of Columbia--Buildings--Washington (D.C.)--1930-1940.
• Public utility companies--Virginia--Arlington--1940-1950.
• Public utility companies--Washington (D.C.)--1920-1930.
• Publishing industry--Washington (D.C.)--1920-1930.
• Publishing industry--Washington (D.C.)--1920-1940.
• Pulpits--Virginia--Burkeville--1910-1920.
• Pulpits--Washington (D.C.)--1940-1950.
• Pumping stations--1930-1940.
• Pumping stations--Maryland--Montgomery County--1910-1920.
• Pumping stations--Maryland--Montgomery County--1930-1940.
• Purdue University--Buildings--Indiana--West Lafayette--1950-1960. (2)
• Putnam, G. R.--(George Rockwell),--b. 1865--Homes & haunts--Washington (D.C.)
• pylons (gateways)
• Pylons (Gateways)--1910-1920.
• Pyramids--Washington (D.C.)--1830-1840.
• Pyramids. (2)