Finding aids (45) Images (33) Electronic resource (1) Sound recordings (1)

Archival materials (57) Collection descriptions (45) Photographs (19) Clippings (11) Manuscripts (9) Correspondence (8) Slides (photographs) (8) Black-and-white photographs (7) Black-and-white negatives (4) Blueprints (4) Business records (4) Color photographs (4) Drawings (4) Scrapbooks (4) Trade literature (4) Books (3) Brochures (3) Diaries (3) Floppy disks (3) Illustrations (3) Interviews (3) Patents (3) Photograph albums (3) Photographic prints (3) Postcards (3) Sketchbooks (3) Advertisements (2) Articles (2) Audiotapes (2) Color transparencies (2) Compact discs (2)

Gardens (11) Art (3) Art museums (3) Art, Asian (3) Engineering (3) Formal gardens (3) Mansions (3) Painters (3) Railroads (3) Works of art (3) World War, 1939-1945 (3) Aeronautics (2) Architecture (2) Art, American (2) Authors (2) Company towns (2) Depressions (2) Driveways (2) Inventors (2) Locomotive industry (2) Manufacturing industries (2) Muralists (2) Museum exhibits (2) Museums (2) Periodicals (2) Radio (2) Sculptors (2) Steel industry and trade (2) Transportation (2) World War, 1914-1918 (2) AIDS (Disease) (1)

Marchand, Richard (4) Freer, Charles Lang (3) Garden Club of America (3) Baldwin Locomotive Works (2) Baldwin, Matthias W. (industrialist) (2) Chase, William Merritt (2) Gellert, Hugo (2) Graham, John (2) Liebes, Dorothy (2) National Museum of American History (U.S.). Division of Electricity and Modern Physics (2) National Museum of American History (U.S.). Division of Mechanical and Civil Engineering (2) National Museum of American History (U.S.). Division of Work and Industry (2) Pitkin, William, Jr. (2) Powers, Hiram (2) White, G. Howard, Dr., Jr. (2) Abbey, Edwin Austin (1) Adams, John Quincy (1) Aerial Experiment Association (1) Aero Club of America (1) Aero Club of Washington (1) Aeronautic Society of New York (1) Aikins, Russell Chorley, 1896- (1) Alexander, John White (1) American Artists' Congress (1) American Association for the Advancement of Science (1) American Council of Learned Societies (1) American Marconi Company. (1) Andy Warhol's Factory (New York, N.Y.) (1) Apollo 17 (Spacecraft) (1) Arrow, Inc. (1) Art Institute of Chicago (1)

United States of America (8) Boston (Mass.) (2) Halliehurst (Elkins, West Virginia) (2) Japan (2) Tanglewood (Catonsville, Maryland) (2) Anuradhapura (Sri Lanka) (1) Argyle (Ellicott City, Maryland) (1) British Columbia (1) Brooklyn Bridge (New York, N.Y.) (1) Canadian Rockies (B.C. and Alta.) (1) Catonsville (Md.) (1) China (1) Crednall (Middleburg, Virginia) (1) Detroit (Mich.) (1) Egypt (1) Grafton Hall (Upperville, Virginia) (1) Hartford (Conn.) (1) Howard County (Md.) (1) India (1) Kandy (Sri Lanka) (1) London (England) (1) New York (1) Pelham (Upperville, Virginia) (1) Pennsylvania (1) Red Ridge Park (Birmingham, Alabama) (1) South Dartmouth (Mass.) (1) Spain (1) Sri Lanka (1) Syria (1) Virginia (1) Vizcaya estate (Florida) (1)

Archives Center, National Museum of American History (16) Archives of American Art (13) Archives of American Gardens (13) Smithsonian Institution Archives (10) Freer Gallery of Art and Arthur M. Sackler Gallery Archives (2) Human Studies Film Archives (1) National Air and Space Museum Archives (1) National Museum of the American Indian (1)