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• N. L. Sansbury Co.--Buildings--Washington (D.C.)--1920-1930.
• N.W. Ayer & Son. (5)
• Nash, Doris Heaton,--b. 1906--Homes & haunts--Maryland--Chevy Chase.
• National Association of Dyers and Cleaners of the United States and Canada--Buildings--Maryland--Silver Spring--1920-1950.
• National Association of Dyers and Cleaners of the United States and Canada--Buildings--Maryland--Silver Spring--1940-1950.
• National Cathedral School for Girls--Buildings--Washington (D.C.)--1910-1920.
• National City Christian Church (Washington, D.C.)--Buildings--1950-1960.
• National emblems--United States--1840-1850.
• National emblems--United States--1870-1890.
• National emblems--United States--1880-1930.
• National emblems--United States--1900-1910.
• National Fisheries Center and Aquarium (U.S.)--Buildings--Washington (D.C.)--1960-1970.
• National Fisheries Center and Aquarium (U.S.)--Buildings--Washington (D.C.)--1960-1980.
• National Gallery of Art (U.S.)--Buildings--Washington (D.C.)--1930-1940. (2)
• National Gallery of Art (U.S.)--Buildings--Washington (D.C.)--1950-1960.
• National Geographic Society (U.S.)--Buildings--Washington (D.C.)--1910-1920. (2)
• National Geographic Society (U.S.)--Buildings--Washington (D.C.)--1910-1930.
• National Geographic Society (U.S.)--Buildings--Washington (D.C.)--1920-1930.
• National Geographic Society (U.S.)--Buildings--Washington (D.C.)--1920-1940.
• National Geographic Society (U.S.)--Buildings--Washington (D.C.)--1930-1940. (2)
• National Geographic Society (U.S.)--Facilities--Washington (D.C.)--1910-1920. (2)
• National Geographic Society (U.S.)--Facilities--Washington (D.C.)--1920-1930. (3)
• National Geographic Society (U.S.)--Facilities--Washington (D.C.)--1920.
• National Geographic Society (U.S.)--Facilities--Washington (D.C.)--1930-1940. (3)
• National Grange--Buildings--Washington (D.C.)--1940-1960.
• National Homes Corporation. (2)
• National Naval Medical Center (U.S.)--Buildings--Maryland--Bethesda--1950.
• National parks & reserves--Washington (D.C.)--1900-1910. (2)
• National parks & reserves--Washington (D.C.)--1920-1930.
• National parks & reserves--Washington (D.C.)--1940-1950.
• National parks & reserves--Washington (D.C.)--1970-1980.
• National parks & reserves--Washington (D.C.)--1980-1990. (2)
• Naval hospitals--Pennsylvania--Philadelphia--1930-1940.
• Naval museums--Washington (D.C.)--1890-1940.
• Naval Research Laboratory (U.S.).--Radio Division.--Fire Control Section--Equipment & supplies--Washington (D.C.)--1940-1950.
• Naval yards & naval stations--Washington (D.C.)--1800-1810.
• Naval yards & naval stations--Washington (D.C.)--1910-1920.
• Naval yards & naval stations.
• Naves--Virginia--Essex County--1950.
• Netherlands--Utrecht.
• Netherlands.
• Nevius, Avon M.,--b. 1878--Homes & haunts--Washington (D.C.)
• New North Church (Boston, Mass.)--Buildings--1800-1810.
• New South Church (Boston, Mass.)--Buildings--1810-1820.
• New York Avenue Presbyterian Church (Washington, D.C.)--Buildings--1920-1930.
• New York Avenue Presbyterian Church (Washington, D.C.)--Buildings--1940-1950.
• New York Harbor (N.Y. and N.J.)
• New York Life Insurance Company--Buildings--New York (State)--New York.
• New York Public Library.
• New York World's Fair--(1939-1940 :--New York, N.Y.)
• Newbold, Fleming,--1873-1949--Homes & haunts--Washington (D.C.)
• Newels--Delaware--Winterthur--1930-1940.
• Newels--Maryland--Chevy Chase--1920-1930.
• Newels--Maryland--Kensington--1940.
• Newels--Massachusetts--Boston--1930-1940.
• Newels--Virginia--Warrenton--1920-1930.
• Newels--Washington (D.C.)--1920-1930.
• Newsrooms--Maryland--Rockville--1960.
• Niches--Washington (D.C.)--1930-1940.
• Niches--Washington (D.C.)--1970-1980.
• Nightclubs--1940.
• Nightclubs--New York (State)--New York--1910-1920.
• Noble, Alfred,--1844-1914--Monuments--Washington (D.C.)
• Norfolk and Washington Steamboat Company--Buildings--Washington (D.C.)--1920-1930.
• Normanstone (Washington, D.C.)--1830.
• Notre-Dame de Paris (Cathedral)
• Notre-Dame de Paris (Cathedral)--1880.
• Notre-Dame de Paris (Cathedral)--1920.
• Noyes, Frank B.--(Frank Brett),--1863-1948--Homes & haunts--Maryland--Silver Spring. (2)
• Nudes--1880-1930.
• Nursing homes--1950-1960.
• Nursing homes--Maryland--Laurel--1950-1960.
• Nursing homes--Washington (D.C.)--1910-1920.
• Nursing homes--Washington (D.C.)--1960-1970.