The Eleanor Weller Collection dates from circa 1978-2006 and consists of documentation 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, 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 painter, teacher, and writer Hans Hofmann measure 29.92 linear feet and 5.00 GB and date from circa 1904 to 2011, with the bulk of the materials dating from 1945 to 2000. The majority of the papers were created after 1932 and document Hofmann's life and professional career after settling in the United States. Among his papers are personal and professional correspondence; records of his schools in Munich, New York City, and Provincetown, Mass.; writings and notes; financial records; photographs; printed matter; estate records; and a small number of personal papers of his second wife, Renate Schmitz Hofmann. Hofmann's personal papers are augmented by a large selection of printed matter, including exhibition catalogs, articles, news clippings, and monographs about Hofmann and modern art, as well as documentary projects including Tina Dickey's compilation of oral histories and records of Hofmann's students, and research materials, sound and video recordings, digital material, and motion picture film created and gathered by Madeline Amgott during the production of two video documentaries about Hans Hofmann released in 1999 and 2002. Hofmann's Library was acquired with his papers; inscribed/annotated volumes have been retained with the collection.

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.

The Richard Marchand Historical Postcard Collection contains approximately 1,200 35mm slide reproductions of postcard images depicting early twentieth century architectural and garden views of over 600 private estates throughout the United States. The collection includes views of estates owned by popular movie stars of the 1920s and 1930s, including Charlie Chaplin, Mary Pickford, Douglas Fairbanks, Claudette Colbert and Buster Keaton.

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.

The records of the Richard York Gallery, a New York gallery specializing in American art from early 1800s to 1950, measure 79.3 linear feet and date from circa 1865-2005, with the bulk of the material dating from 1981 to 2004. Three-fourths of the records are artists' artwork files, documenting the sale and consignment of nearly 6,500 works of art. The gallery's activities are also recorded through correspondence, client files, gallery invoices, inventories, business and financial records, printed materials, scrapbooks, photographic materials of artwork, and estate records for the John Marin estate and Sergio Stella estate (Joseph Stella). An addition of 10.2 linear feet, dated circa 1865 to 2005, includes artists' files arranged alphabetically containing printed material, clippings, exhibition announcements, and scattered correspondence and financial documents.

The papers of Fred Lawrence Whipple (FLW) document his astronomical research; his professional work in the field of astronomy; and his career as Director of the SAO. They include correspondence with professional colleagues, amateur astronomers, SAO staff scientists, Smithsonian Institution officials, scientific societies and professional ...

The Maida Babson Adams American Garden Collection documents the work of Molly Adams, a free-lance garden photographer who photographed hundreds of private and public gardens, many of them in the mid-Atlantic region, from the late 1950s through the mid-1990s. It includes slides, photographic prints, negatives and transparencies. A significant number of images document the work of landscape designers Nelva M. Weber, Alice Recknagel Ireys, and Friede Stege. Roughly 50 gardens do not have an identified location. Some images have captions and other information written on them.

The papers of historian Henry P. Whitehead measure 156.91 linear feet and date from 1843 to 2010 (bulk 1945-1986). The collection documents Whitehead's careers, as well as his family and personal life. The collection also includes the personal papers of Tomlinson D. Todd, Elizabeth B. Delaney and the Howard Theatre Foundation. The combined collection is comprised of black theatrical memorabilia; materials relating to civil rights activities in the District of Columbia; and the African American experience in general. Included are playbills, sheet music, admission tickets, newspapers, magazines, books, photographs, clippings, flyers, brochures, pamphlets, sound recordings, research files, and other material.

The Richard Murray research material regarding mural painting in the United States measures 20.5 linear feet and dates from 1896 to 2006 with the bulk of the material dating from 1970 to 2006. The collection is comprised of Murray's extensive research files, scattered writings, and photographic materials for his life-long research on mural painting in the United States.