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- R.R. Donnelly and Sons Company.
- Radio broadcasting--Illinois--Chicago--1930-1940.
- Radio stations--Washington (D.C.)--1920-1930.
- Rafters--Washington (D.C.)--1920-1930.
- Railings--1880-1900.
- Railings--1940-1950.
- Railings--Maryland--College Park--1930-1940.
- Railings--Maryland--Silver Spring--1920-1950.
- Railings--Maryland--Silver Spring--1960.
- Railings--Washington (D.C.)--1900-1920.
- Railings--Washington (D.C.)--1910-1920. (2)
- Railings--Washington (D.C.)--1910-1930.
- Railings--Washington (D.C.)--1920-1930. (8)
- Railings--Washington (D.C.)--1920-1940.
- Railings--Washington (D.C.)--1930-1940. (2)
- Railings--Washington (D.C.)--1940-1950. (3)
- Railings--Washington (D.C.)--1950-1960.
- Railings. (6)
- Railroad cars--1960-1970.
- Railroad companies--Washington (D.C.)--1910.
- Railroad locomotives--1950-1960.
- Railroad locomotives--1970-1980.
- Railroad stations--1950-1980.
- Railroad stations--Maryland--Chevy Chase--1890-1950.
- Railroad stations--New York (State)--New York--1900-1940.
- Railroad stations--New York (State)--Pelham Manor--1900-1910.
- Railroad stations--Virginia--Charlottesville--1910-1920. (2)
- Railroad stations--Washington (D.C.)--1900-1910. (2)
- Railroad stations--Washington (D.C.)--1940-1950.
- Railroad stations. (2)
- Railroad tracks--Washington (D.C.)--1890-1900.
- Railroad tracks--Washington (D.C.)--1920-1930.
- Randolph Air Force Base (Tex.) (7)
- Randolph Field (Tex.)--1920-1930.
- Ray, George N.--(George Nicholas),--1887-1959--Homes & haunts--Washington (D.C.)
- Reading rooms--Vermont--Rutland--1920-1950.
- Reading Rooms--Washington (D.C.)--1930-1940. (2)
- Reading rooms--Washington (D.C.)--1970-1980.
- Real estate business--Washington (D.C.)--1910-1920.
- Real estate development--1940-1980. (2)
- Real estate development--1950-1960. (2)
- Real estate development--1960-1970. (5)
- Real estate development--Maryland--Chevy Chase--1920-1930.
- Real estate development--Maryland--Chillum--1940-1950.
- Real estate development--Maryland--Riverdale (Prince George's County)--1960-1970.
- Real estate development--Virginia--Fairfax County--1940-1980.
- Real estate development--Virginia--Woodbridge--1940-1950.
- Real estate development--Washington (D.C.)--1940-1980.
- Real estate development--Washington (D.C.)--1950-1960. (2)
- Ream, Vinnie,--1847-1914--Homes & haunts--Washington (D.C.)
- Reception rooms--Maryland--College Park--1950-1960.
- Reception rooms--Washington (D.C.)--1910-1920.
- Reconstruction (1914-1939)
- Recreation rooms--1960-1970.
- Recreation rooms--Maryland--Bethesda--1950-1960.
- Recreation rooms--Maryland--Cambridge--1940-1950.
- Recreation rooms--Ohio--Cincinnati--1920-1930.
- Recreation rooms--Washington (D.C.)--1930-1940.
- Recreation rooms--Washington (D.C.)--1940-1950.
- Recreation rooms--Washington (D.C.)--1950-1960.
- Recreation rooms--Washington (D.C.)--1950-1970.
- Recreation rooms--Washington (D.C.)--1960-1970.
- Recreation--Ohio--Cleveland--1910-1920.
- Rectories--Virginia--Alexandria--1930-1940.
- Recycled structures--Maryland--Brookmont--1950-1960.
- Recycled structures--Maryland--Laurel--1960-1970.
- Recycled structures--Massachusetts--Somerville--1810-1820.
- Recycled structures--New York (State)--East Williston--1910-1920.
- Recycled structures--Virginia--Arlington--1940-1950.
- Recycled structures--Virginia--Turbeville--1920-1960.
- Recycled structures--Washington (D.C.)--1910-1920. (2)
- Recycled structures--Washington (D.C.)--1910-1940.
- Recycled structures--Washington (D.C.)--1920-1930. (10)
- Recycled structures--Washington (D.C.)--1930-1940. (2)
- Recycled structures--Washington (D.C.)--1940-1950.
- Recycled structures--Washington (D.C.)--1960-1970. (2)
- Recycled structures.
- Redemptorists--Buildings--Washington (D.C.)--1930-1940.
- Refectories--Washington (D.C.)--1930-1940.
- Refrigerators--1890-1900.
- Refrigerators--1910-1920. (2)
- Refrigerators--1910-1930.
- Refrigerators--1920-1930. (2)
- Refuse disposal--1930.
- Reinforced concrete construction--1910-1920. (2)
- Reinforced concrete construction--1920-1940.
- Religious architectural elements--Maryland--Silver Spring--1960.
- Religious architectural elements--Ohio--Cincinnati--1920-1930.
- Religious architectural elements--Washington (D.C.)--1940-1950. (4)
- Religious articles--1920-1930. (2)
- Religious articles--1940-1950. (2)
- Religious articles--1940-1960.
- Religious articles.
- Religious dwellings--1920-1930.
- Religious dwellings--Maryland--Oxen Hill--1960.
- Religious dwellings--Massachusetts--Vineyard Haven--1920-1930.
- Religious dwellings--Washington (D.C.)--1910-1920. (3)
- Religious education--Washington (D.C.)--1950-1960.
- Religious facilities--1910-1920. (2)
- Religious facilities--1910-1950.
- Religious facilities--1920-1930.
- Religious facilities--1920-1950.
- Religious facilities--Italy--Rome.
- Religious facilities--Washington (D.C.)--1930-1940.
- Religious facilities.
- Remodeling--New Jersey--Plainfield--1920-1930.
- Research facilities--Washington (D.C.)--1960-1970.
- Resorts--1970. (2)
- Resorts--Arizona--Chandler--1920-1930. (2)
- Resorts--California--1920-1930.
- Resorts--California--Beverly Hills--1920-1930.
- Resorts--United States Virgin Islands--Saint Croix--1950-1970.
- Rest homes--Washington (D.C.)--1900-1920.
- Rest homes--Washington (D.C.)--1910-1930.
- Rest homes--Washington (D.C.)--1920-1930. (2)
- Rest homes--Washington (D.C.)--1930-1940.
- Rest homes--Washington (D.C.)--1940-1950.
- Rest rooms--Washington (D.C.)--1930-1940.
- Rest stops--Virginia--Henry G. Shirley Memorial Highway--1930-1960.
- Restaurant--1910-1930.
- Restaurants--1910-1950. (4)
- Restaurants--1930-1940. (3)
- Restaurants--1930-1950.
- Restaurants--1930-1960.
- Restaurants--1940-1950.
- Restaurants--1940-1960.
- Restaurants--1940.
- Restaurants--1950-1960.
- Restaurants--California--Los Angeles--1940-1950.
- Restaurants--Canada--Montreal--1940-1950.
- Restaurants--Germany--Kühnauer See--1930-1940.
- Restaurants--Maryland--Bethesda--1950-1960.
- Restaurants--Maryland--Bethesda--1960-1970.
- Restaurants--Maryland--Jessup--1960-1970.
- Restaurants--Maryland--Laurel--1950-1960.
- Restaurants--Maryland--Mount Rainier--1960-1970.
- Restaurants--Maryland--Potomac--1940-1950.
- Restaurants--Maryland--Silver Spring--1930-1960.
- Restaurants--Maryland--Wheaton--1950-1960.
- Restaurants--New York (State)--New York--1910-1920.
- Restaurants--New York (State)--New York--1910-1930.
- Restaurants--New York (State)--New York--1910-1940. (2)
- Restaurants--New York (State)--New York--1920-1930. (8)
- Restaurants--New York (State)--New York--1920-1940. (2)
- Restaurants--New York (State)--New York--1930-1940. (2)
- Restaurants--New York (State)--New York--1940-1950. (5)
- Restaurants--North Carolina--Greensboro--1950-1960.
- Restaurants--Pennsylvania--Allentown--1930-1940.
- Restaurants--United States--1930-1950.
- Restaurants--Virginia--Arlington--1930-1940. (2)
- Restaurants--Virginia--Arlington--1960-1970.
- Restaurants--Virginia--Fredericksburg--1950-1960.
- Restaurants--Virginia--Richmond--1940-1950.
- Restaurants--Washington (D.C.)--1840-1850.
- Restaurants--Washington (D.C.)--1910-1920. (2)
- Restaurants--Washington (D.C.)--1910-1940.
- Restaurants--Washington (D.C.)--1920-1930. (2)
- Restaurants--Washington (D.C.)--1920-1940.
- Restaurants--Washington (D.C.)--1930-1940. (2)
- Restaurants--Washington (D.C.)--1930-1950.
- Restaurants--Washington (D.C.)--1940-1950. (2)
- Restaurants--Washington (D.C.)--1950-1960.
- Restaurants--Washington (D.C.)--1950-1970.
- Restaurants--Washington (D.C.)--1960-1970.
- Restaurants--Washington (D.C.)--1970-1980.
- Restaurants--Washington (D.C.)--1980-1990.
- Restaurants. (2)
- Retaining walls--New York (State)--New York--1920-1930.
- Retaining walls--Washington (D.C.)--1920-1930. (3)
- Retaining walls--Washington (D.C.)--1930-1940.
- Retaining walls--Washington (D.C.)--1970-1980.
- Reviewing stands--Washington (D.C.)--1940.
- Revolving doors--Washington (D.C.)--1900-1920.
- Revolving doors--Washington (D.C.)--1910-1920.
- Revolving doors--Washington (D.C.)--1920-1930.
- Rhine River.
- Rice, Luther,--1783-1836--Monuments--Maryland--Silver Spring
- Richelieu, Armand Jean du Plessis,--duc de,--1585-1642--Homes & haunts.
- Riggs National Bank--Buildings--Washington (D.C.)--1890-1910.
- Riggs National Bank--Buildings--Washington (D.C.)--1920-1930. (6)
- Riggs National Bank--Buildings--Washington (D.C.)--1940-1950.
- Riggs National Bank--Facilities--Washington (D.C.)--1920-1930.
- Rivers--Russia (Federation)--Ostrov (Pskovskai︠a ︡oblastʹ)--1850-1860.
- Rivers. (4)
- Rives, George Barclay--Homes & haunts--Virginia--Cobham. (2)
- Roads--Virginia--Mount Vernon--1930-1940.
- Robbins, Irene de Bruyn--Homes & haunts--Washington (D.C.)
- Robbins, Warren Delano,--1885-1935--Homes & haunts--Washington (D.C.)
- Robert S. Brookings Graduate School of Economics and Government--Buildings--Washington (D.C.)--1920-1930.
- Rock Creek Park (Washington, D.C.)--1920-1930.
- Rock formations. (5)
- Rocking chairs--1920-1960.
- Rodin Studios (New York, N.Y.)
- Roman temples--Italy--Tivoli.
- Roman temples.
- Romulo, Carlos P.--(Carlos Peña),--1899-1985--Homes & haunts--Washington (D.C.)
- Roof gardens--Washington (D.C.)--1910-1920. (4)
- Roof gardens--Washington (D.C.)--1910-1930.
- Roof gardens--Washington (D.C.)--1920-1930. (2)
- Roof gardens--Washington (D.C.)--1940.
- Roof gardens--Washington (D.C.)--1970-1980.
- Roof gardens. (2)
- Roof trusses--1880-1950.
- Roof trusses--Maryland--Rockville--1920-1930.
- Roofing tiles. (4)
- Roofs--1930-1940.
- Roofs--1960-1970. (5)
- Roofs--Maine--Augusta--1820-1830.
- Roofs--Maryland--Baltimore--1940-1950.
- Roofs--Maryland--Cheverly--1950-1970.
- Roofs--Maryland--La Plata--1950-1970.
- Roofs--Maryland--Wheaton--1950-1960.
- Roofs--Pennsylvania--Philadelphia--1940.
- Roofs--Virginia--Alexandria--1950-1970.
- Roofs--Virginia--Fredericksburg--1950-1960.
- Roofs--Virginia--Rosslyn--1940.
- Roofs--Virginia--Winchester--1940-1950.
- Roofs--Washington (D.C.)--1850-1860.
- Roofs--Washington (D.C.)--1930.
- Roofs--Washington (D.C.)--1940-1950.
- Roofs--Washington (D.C.)--1950-1970.
- Roofs--Washington (D.C.)--1970-1980.
- Roofs. (7)
- Rooms & spaces--New York (State)--New York--1920-1930.
- Roosevelt, Franklin D.--(Franklin Delano),--1882-1945--Inaugurations.
- Roosevelt, Franklin D.--(Franklin Delano),--1882-1945--Monuments--Washington (D.C.) (2)
- Roosevelt, Franklin D.--(Franklin Delano),--1882-1945. (3)
- Root, Elihu,--1845-1937.
- Rosary College (River Forest, Ill.)--Buildings--1920.
- Rose, Wm. Clayton--(William Clayton),--1890-1973--Homes & haunts--Washington (D.C.)
- Rosemont College. (2)
- Rosettes--Washington (D.C.)--1910-1920. (2)
- Rosettes--Washington (D.C.)--1920-1930. (4)
- Rosewell Plantation (Va.)--1920-1930.
- Rotundas--Washington (D.C.)--1970-1980.
- Rotundas. (5)
- Roundels--Virginia--Fairfax--1930-1940.
- Row houses--1880-1900.
- Row houses--1890-1900.
- Row houses--1900-1910.
- Row houses--1920-1930. (5)
- Row houses--1930-1940. (3)
- Row houses--1960-1970. (5)
- Row houses--1960. (3)
- Row houses--Maryland--Kensington--1960-1980.
- Row houses--Maryland--Rockville--1960-1970.
- Row houses--Maryland--Wheaton--1970-1980.
- Row houses--Virginia--Alexandria--1960-1980.
- Row houses--Virginia--Arlington--1930-1940.
- Row houses--Virginia--McLean--1970.
- Row houses--Washington (D.C.)--1880-1890.
- Row houses--Washington (D.C.)--1880-1900.
- Row houses--Washington (D.C.)--1890-1920.
- Row houses--Washington (D.C.)--1890-1930.
- Row houses--Washington (D.C.)--1900-1910. (5)
- Row houses--Washington (D.C.)--1900-1920. (5)
- Row houses--Washington (D.C.)--1900-1930. (2)
- Row houses--Washington (D.C.)--1910-1920. (40)
- Row houses--Washington (D.C.)--1910-1940. (2)
- Row houses--Washington (D.C.)--1920-1930. (33)
- Row houses--Washington (D.C.)--1920-1940.
- Row houses--Washington (D.C.)--1920. (2)
- Row houses--Washington (D.C.)--1930-1940. (3)
- Row houses--Washington (D.C.)--1930-1980.
- Row houses--Washington (D.C.)--1940-1950. (6)
- Row houses--Washington (D.C.)--1950-1960. (21)
- Row houses--Washington (D.C.)--1950.
- Row houses--Washington (D.C.)--1960-1970. (17)
- Row houses--Washington (D.C.)--1960-1980. (2)
- Row houses--Washington (D.C.)--1960. (10)
- Row houses--Washington (D.C.)--1970-1980. (2)
- Row houses--Washington (D.C.)--1980.
- Row houses. (9)
- Rugs--Japan--Tokyo--1910-1930.
- Rugs--Wisconsin--Milwaukee--1910-1920.
- Ruins. (5)
- Runways (Aeronautics)--Washington (D.C.)--1920-1930.
- Rural schools--New York (State)--East Williston--1910-1920.
- Russell, Cornelius Peyton--Homes & haunts--Washington (D.C.)
- Rustic work--Maryland--Chevy Chase--1930-1940.
- Rutledge, Archibald Hamilton,--1883-1973--Homes & haunts.