Collection documents the development of the Holter Monitor, a portable device for continuously monitoring heart activity for an extended period, through engineering logbooks, drawings, operator manuals, correspondence, photographs, sales brochures and catalogs, biographical information about the engineering staff who worked on the monitor, patents and trademarks, and marketing and sales materials.

The Marcel Breuer papers, 1920-1986, contain biographical material, correspondence, business and financial records, interviews, notes, writings, sketches, project files, exhibition files, photographs, and printed material that document the career of architect and designer Marcel Breuer.

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.

Collection consists of three film elements of three films: The Dairy Industry and the Canning of Milk; Making High Grade Papers and From Ore to Finished Product as part of the National Film Preservation Foundation's collaborative film repatriation project with the EYE Filmmuseum.

The Technical Reference Files comprise an artificial collection that currently contains 1,900 cubic feet of aviation and space related materials, organized in 22 subject series. File materials include photographs, press releases, clippings, correspondence, reports, and brochures, on individuals, organizations, events, and objects.

The collection consists of archival materials assembled by National Museum of American History Curator William Lawrence Bird. The materials were used as background research for the publication of his book Holidays on Display (New York: Princeton Architectural Press, 2007), and as exhibit objects for the exhibit by the same name that opened shortly after the museum's architectural renovation (November 2009-September 2010). The materials include advertising and trade literature, especially for department stores and with emphasis on the display of toys; catalogs; photographs and slides; postcards; parade programs; design drawings; correspondence; stock certificates, and miscellaneous items relating to department stores and their displays, parades and the amusement industry.

The papers of New York art collector and philanthropist, Joseph F. McCrindle, measure 5.3 linear feet and date from 1877-2013. The collection documents McCrindle's art collecting, art donations, philanthropy, family affairs, and personal estate. Found are extensive art inventories, sales receipts, gift and loan documentation, and photographs of artwork. The papers also include Joseph McCrindle's estate records and wills, family papers, records from the Joseph F. McCrindle Foundation, correspondence with museums and galleries, and photographs of McCrindle and family members.

The personal papers of Charles Lang Freer, the industrialist and art collector who founded the Freer Gallery of Art. The papers include correspondence, diaries, art inventories, scrapbooks of clippings on James McNeil Whistler and other press clippings, and photographs.

The Rockwell Kent papers measure 88.0 linear feet and date from circa 1840 to 1993 with the bulk of the collection dating from 1935 to 1961. The collection provides comprehensive coverage of Kent's career as a painter, illustrator, designer, writer, lecturer, traveler, political activist, and dairy farmer.

The collection dates from 1900 to 1997 and mostly includes images taken in South Africa. The images document the peoples of South Africa, particularly the Loved, Ndebele, San, Sotho, Xhosa, and Zulu peoples. Locations photographed include Basutoland (now Lesotho), Bechuanaland (now Botswana), Johannesburg, Natal, Pretoria, Soweto, Swaziland, Transkei, Transvaal, the Umzimkulu Valley and Zululand. Manuscript and office files include clippings, correspondence, exhibition announcements, invitations and reviews, notes, essays, receipts, and other materials that document Larrabee's career, family history, and personal life.