The papers of New York painter and sculptor Richard Artschwager measure 5.6 linear feet and date from 1959-2013. The papers include extensive correspondence, recorded talks and a lecture, exhibition files, printed material, and photographs.

The papers of writer, art critic and collector Bernard Harper Friedman, 1926-2011, bulk 1943-2010, measure 30.6 linear feet. Extensive professional and personal correspondence, 41 diaries, a large number of his published and unpublished writings, and subject files document Friedman's career as a writer, relationships with cultural institutions and art world figures, and his personal life. Also included are biographical materials, interviews, printed material, 5 scrapbooks and photographs.

The papers of art historian E. P. Richardson measure 28.7 linear feet and date from 1814-1996, with the bulk of the materials dating from 1921-1996. Within the papers are scattered biographical materials; acquisition files for Richardson's personal art collection; professional and personal correspondence with colleagues, art historians and critics, artists, museums, galleries, and dealers; numerous writings, including manuscripts and research files for his published books, articles, and lectures; general research notebooks and files compiled by Richardson on a wide variety of art-related topics and artists; professional and committee files; as well as a smaller amount of Constance C. Richardson's papers.

The papers of contemporary and folk art curator, historian, and consultant Dorothy C. Miller measure 34.6 linear feet and date from 1853-2013, with the bulk of the material dating from 1920 to 1996. The papers primarily concern Miller's private art consulting work outside of her curatorial work at the Museum of Modern Art in New York City. Found are scattered biographical materials, extensive correspondence and subject files, and project files for her art consulting work for the Rockefeller family, Rockefeller University, Chase Manhattan Bank, the Port Authority of New York and New Jersey, the World Trade Center, and other miscellaneous corporate and private clients. Miller's work as a trustee and committee member of various public and private boards and commissions is also represented here. Additionally, the papers contain Miller's research files on Edward Hicks and folk art, and a small number of files of her husband Holger Cahill about his work as Director of the Federal Art Project. There is a scattered documentation of Miller's early curatorial work with Holger Cahill on the First Municipal Art Exhibition (1934) held at the RCA Building in Rockefeller Center. Also found is Dorothy Miller's collection of artists' Christmas cards and photographs of Miller and others. An addition to the papers includes biographical material; family papers; correspondence; professional files; art collection and client files; printed material; and photographic material. While a small number professional files are included, the majority of the addition relates to her personal life, including correspondence with her husband Holger Cahill, and files pertaining to her personal art collection.

The papers of Boston portraitist and painter Polly Thayer (Starr) (1904-2006) measure 21.6 linear feet and 0.807 GB and date from 1846 to 2008, with the bulk of the materials dating from 1921-2008. The papers document Thayer's personal life and career as a painter, portraitist, and pastel artist. Found within the papers are biographical materials, extensive family papers, correspondence with artists and art venues, interviews, writings, subject files, organization files, exhibition files, art inventory records, printed and digital materials, five sketchbooks, artwork, and photographs.

The records of New York City Kraushaar Galleries measure 91.9 linear feet and date from 1877 to 2006. Three-fourths of the collection documents the gallery's handling of contemporary American paintings, drawings, and sculpture through correspondence with artists, private collectors, museums, galleries, and other art institutions, interspersed with scattered exhibition catalogs and other materials. Also included are John F. Kraushaar's estate records; artists' files; financial ledgers documenting sales and gallery transactions; consignment and loan records; photographs of artwork; sketchbooks and drawings by James Penney, Louis Bouché, and others; and two scrapbooks.

The Library of Congress Copyright Deposit Collection is comprised of 2,335 photomechanical reproductions of works by 741 artists (mostly American). The large-format prints, deposited with the Library of Congress for copyright between 1890 and 1945, represent a broad range of nineteenth- and twentieth-century American art.

The records of the American Federation of Arts (AFA) provide researchers with a complete set of documentation focusing on the founding and history of the organization from its inception through the 1960s. The collection measures 79.8 linear feet, and dates from 1895 through 1993, although the bulk of the material falls between 1909 and 1969. Valuable for its coverage of twentieth-century American art history, the collection also provides researchers with fairly comprehensive documentation of the many exhibitions and programs supported and implemented by the AFA to promote and study contemporary American art, both nationally and abroad.

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 Leo Castelli Gallery records measure 215.9 linear feet 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.