The collection measures 20.8 linear feet, dates from 1885 to 1991 (bulk dates 1908-1986) and documents the career of lithographer, teacher, and painter Prentiss Taylor. The collection consists primarily of subject/correspondence files (circa 16 ft.), reflecting Prentiss' career as a lithographer and painter, his association with figures prominent in the Harlem Renaissance, notably Carl Van Vechten and Langston Hughes, his activities as president of the Society of Washington Printmakers and other art organizations, his work in art therapy treating mental illness, and his teaching position at American University. The subject files contain mostly correspondence, but many include photographs and printed material. Also included are biographical, financial, legal and printed material; several hundred photographs; notes and writings; sketchbooks, drawings and a few prints by Taylor; and scrapbooks dating from 1885-1956.

The records of the Downtown Gallery date from 1824 to 1974 (bulk 1926-1969) and measure 109.56 linear feet. The records present a comprehensive portrait of a significant commercial gallery that operated as a successful business for more than forty years, representing major contemporary American artists and engendering appreciation for early American folk art. There is an unprocessed addition to this collection dating circa 1970 of a single financial/legal document.

The Eleanor Weller Collection dates from circa 1978-2006 and consists of photographic images and research files relating to The Garden Club of America's Slide Library of Notable American Parks and Gardens (later donated to the Smithsonian Institution as The Garden Club of America Collection) and the book, The Golden Age of American Gardens: Proud Owners, Private Estates, 1890-1940, co-written by Weller and Mac Griswold, as well as thousands of photographic images of historic and contemporary gardens compiled or taken by Weller. Materials include correspondence, research notes, clippings, brochures, lecture scripts, photocopied images from archival repositories, and original and duplicate 35mm slides.

The papers of art historican August Jaccaci measure 7.2 linear feet and date from 1889 to 1935, with the bulk of the material dating from 1904 to 1914. The collection documents Jaccaci's work as an art historian, writer, and editor, primarily during the period he researched, compiled, and published his book Noteworthy Paintings in Private American Collections. More than one-half of the collection consists of extensive correspondence to and from many notable artists, collectors, and art historians, including John La Farge, Kenyon Cox, Isabella Stewart Gardner, and Bernard Sickert concerning the research and publication of the book. The papers also house legal files, writings and notes, art collection research files, and photographs of artwork.

The papers of Aleš Hrdlička, curator in the Division of Physical Anthropology, Department of Anthropology, United States National Museum of the Smithsonian Institution, offer considerable insight into the development of physical anthropology in the first half of this century. The papers include honors bestowed on Hrdlička, autobiographical notes, correspondence with many of the leading anthropologists of the day, anthropometric and osteometric measurements and observations (forming most of the collection), extensive photographs of Hrdlička's field work, manuscripts, research materials, and "My Journeys" (essentially a diary Hrdlička kept of his field work). In addition, there is material of a personal nature. The papers date from 1875 to 1966, but the bulk of the materials date from 1903 to 1943, the time of Hrdlička's career at the USNM.

The Frank K. M. Rehn Galleries records measure 21.8 linear feet and are dated 1858-1969 (bulk 1919-1968). The records consist mainly of business correspondence with collectors, artists, museums and arts organizations, colleagues, and others. A small amount of Frank K. M. Rehns personal correspondence and a few stray personal papers of individual artists are interfiled. Also included are financial records, scrapbooks, printed matter, miscellaneous records, and photographs documenting most of the history of a highly regarded New York City art gallery devoted to American painting.

The Victor D. Spark papers measure 22.2 linear feet and date from circa 1830 to 1983, with the bulk of the material from 1930 to 1970. The papers document Spark's career as a New York City art dealer and appraiser who was most active from World War II through the 1970s, focusing on Old Masters paintings and 19th and early 20th century American art. Found within the papers are biographical materials, artist files, client files, financial records, legal records, printed material, and photographs.

The papers of printmaker and painter Adolf Dehn measure 6.6 linear feet and date from 1912-1987. The collection contains extensive correspondence, as well as writings, exhibition announcements, catalogs, clippings, invoices, receipts, legal documents, scrapbooks, artwork, and photographs. There is also scattered correspondence of Virginia Dehn, mostly concerning her husband Adolf Dehn.

This collection contains over 37,000 35mm slides, 3,000 glass lantern slides and garden files that may include descriptive information, photocopied articles (from journals, newspapers, or books), planting lists, correspondence, brochures, landscape plans and drawings. Garden files were compiled by Garden Club of America (GCA) members for most of the gardens included in the collection. Some gardens have been photographed over the course of several decades; others only have images from a single point in time. In addition to images of American gardens, there are glass lantern slides of the New York Flower Show (1941-1951) and trips that GCA members took to other countries, including Mexico (1937), Italy, Spain, Japan (1935), France (1936), England (1929), and Scotland. A number of the slides are copies of historic images from outside repositories including horticultural and historical societies or from horticultural books and publications. The GCA made a concerted effort in the mid-1980s to acquire these images in order to increase its documentation of American garden history. Because of copyright considerations, use of these particular images may be restricted.

Frank Spencer was a historian of biological anthropology who began his career as a medical laboratory technician. His papers include correspondence, manuscripts, notes, research files, teaching materials, photographs, and audiotapes. Spencer's research on the Piltdown hoax as well as the Piltdown research of Ian Langham, whose work Spencer continued after his death in 1984, and Spencer's research on the life and career of Aleš Hrdlička for his dissertation are both represented in the collection.