This collection consists of the records of the Waco Aircraft Company. The material includes office files of the company, marketing and sales information, and design data. Also included are original engineering drawings and report files.

The papers of New York artist, critic, historian, writer, art consultant and curator Walter Pach, measure 20.7 linear feet and date from 1857-1980. The collection documents Pach's promotion of modernism through his role in the landmark 1913 Armory Show, his relationships with artists and art-world figures and his extensive writings on art. Records include biographical material, correspondence with family, friends and colleagues including noted artists, handwritten and edited versions of manuscripts by Pach, diaries and journals, business records, printed material, scrapbooks, sketchbooks and artwork by Pach and others, and photographs of Pach and his family, friends, and colleagues. The collection also includes 12 linear feet of selections from Walter Pach's library.

This collection is an amalgamation of letters written and recieved by prominent figures in 19th and 20th century American Art. Included in the collection is a significant portion of letters from Abbott Thayer to correspondents from his circle of family, friends and art world figures such as Maria Oakey Dewing and Samuel Coleman.

Reverend James Owen Dorsey (1848-1895) was a missionary and Bureau of American Ethnology ethnologist who conducted extensive research on Siouan tribes and languages.The papers of James Owen Dorsey comprise mostly ethnographic and linguistic materials on various tribes of the Siouan language family as well as tribes from Siletz Reservation in Oregon. These materials include texts and letters with interlineal translations; grammar notes; dictionaries; drawings; and his manuscripts. In addition, the collection contains Dorsey's correspondence, newspaper clippings, his obituaries, and reprints.

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 Myron Bement Smith collection consists of two parts, the papers of Myron Bement Smith and his wife Katharine and the Islamic Archives. It contains substantial material about his field research in Italy in the 1920s and his years working on Islamic architecture in Iran in the 1930s. Letters describe the milieu in which he operated in Rochester NY and New York City in the 1920s and early 1930s; the Smiths' life in Iran from 1933 to 1937; and the extensive network of academic and social contacts that Myron and Katharine developed and maintained over his lifetime. The Islamic Archives was a project to which Smith devoted most of his professional life. It includes both original materials, such as his photographs and notes, and items acquired by him from other scholars or experts on Islamic art and architecture. Smith intended the Archives to serve as a resource for scholars interested in the architecture and art of the entire Islamic world although he also included some materials about non-Islamic architecture.

The records document the development and use of Reddy Kilowatt, a cartoon figure trademark created in 1926 by Ashton B. Collins, Sr. More than 150 investor-owned electric utilities in the United States and at least twelve foreign countries licensed the use of the Reddy Kilowatt trademark. The records include a wide range of textual and visual materials and sound and moving image recordings.

The Leo Castelli Gallery records measure 215.9 linear feet and 0.001 GB and date from circa 1880-2000, with the bulk of the materials dating from the gallery's founding in 1957 through Leo Castelli's death in 1999. The major influence of dealer Leo Castelli and his gallery on the development of mid-to-late twentieth century modern art in America is well-documented through business and scattered personal correspondence, administrative files, exhibition files, extensive artists' files and printed materials, posters, awards and recognitions, photographs, and sound and video recordings. Also included are records for the subsidiary firms of Castelli Graphics and Castelli/Sonnabend Tapes and Films.