The papers of art dealer and gallerist Niel Lovisco measure 0.2 linear feet and date from 1942 to 1989. The collection contains material relating to art galleries owned or directed by Niel Lovisco, including the Lovisco Gallery, the Bearskin Neck Gallery, and the Art Center Gallery, and consists of printed material, gallery records, Art Inview records, and a subject file on William Meyerowitz and Theresa Bernstein.

The papers of art dealer Ruth Teschner Costantino measure 0.4 linear feet and date from 1923 to 1981. The collection includes biographical material, photographs, writings, correspondence, financial records, and printed material.

The papers of art dealer R. Kirk Askew, director of the New York branch of the Durlacher Bros. art firm, measure 0.6 linear feet and date from 1942 to 1958. The collection includes correspondence with artists Cady Wells, Walter Stuempfig, Walter Quirt, Edward Melcarth, Kurt Seligmann, Leonid Berman, Hyman Bloom, Peter Blume, Carlyle Brown, James W. Fosburgh, Stephen Greene, and Walter Stein.

This small collection of papers of New York City art dealer Takis Efstathiou papers regarding Los Angeles artist Ynez Johnston measure 0.8 linear feet and date from 1954-2004. The papers include correspondence with Johnston and with institutions regarding Johnston's work and career, a few business records from the Ericson Gallery (owned by Efstathiou), printed material about Johnston, and photographic material of Johnston's artwork and of the artist at home, in her studio, and of the exhibition opening organized by Efstathiou at Ericson Gallery in 1979.

The papers of New York art dealer, writer and teacher Martin Diamond measure 3.2 linear feet and date from 1928 to 2013. The materials involve to a limited degree Diamond's wife, Harriette Diamond, co-owner and co-operator of Martin Diamond Fine Arts, Inc. Their gallery work and relationships with artists they represented are documented by writings, subject and artist files, and photographic materials. Subject files concern American abstract art, particularly the 20th century Transcendental abstract painters, and include printed materials, correspondence and photographic materials. Artists' files include similar materials and some writings by artists. Photographic materials are of artworks and exhibition installations.

The Enid Klass correspondence regarding George Perutz art collection measures 0.4 linear feet and dates from 1965-2009.. The majority of the letters are from Perutz to various dealers and artists, inquiring about artworks and tracking provenance. There is also correspondence between George Perutz and his friend and art consultant Enid Klass indicating their exchange of often detailed information about various art works to consider buying and comments about the current art scene. Correspondence between Perutz and dealers have been forwarded to Klass, sometimes with an additional note to Klass. Perutz collected American art, including artists John James Audubon, Thomas Hart Benton, Stuart Davis, Philip Evergood, Marsden Hartley, Childe Hassam, Robert Henri, Edward Hopper, George Inness, Yasuo Kuniyoshi, John Marin, Maurice Prendergast, John Sloan, Grant Wood, and others. Correspondence with galleries includes Ankrum, Banfer, Downtown, David B. Findlay, Forum, Martha Jackson, Kennedy, Kraushaar, Landou-Alan, Midtown, Milch, Rosenberg, Jacques Seligmann, Zabriskie, and others.

The papers of Parisian art dealer, René Gimpel (1881-1945), dating from circa 1890-1966 (bulk 1902-1930s), and measuring 0.4 linear feet, provide a small but significant window into the crucial relationship between American collectors and the art dealers who supplied them, as they amassed some of the most influential art collections of the first half of the twentieth century. Gimpel's work as an art dealer is documented through correspondence with his parents, clients, business associates, and collectors, including Helen Frick and Duveen Brothers, Blake-More Godwin and the Toledo Museum of Art, Florence Libbey, Samuel H. Kress, Silva White, and others, and through printed material, writings by Gimpel, and photographs of René and Ernest Gimpel and others.

The papers of gallery director, art dealer and publisher Jsrael Ber Neumann (1887-1961) measure 2.1 linear feet and date from 1905 to 1967. The papers document Neumann's career as the director of galleries in Berlin and Munich, Germany (1910-1924) as well as the New Art Circle gallery in New York City (1924-1952). Neumann was a respected art dealer, publisher of Artlover periodical, founder of Gehenna Press, and frequent lecturer. Found within his papers are correspondence with artists and museums, writings, printed materials mostly comprised of exhibition catalogues, artwork, and photographic materials.

The papers of African American painter and former art dealer Peter A. Bradley measure 0.3 linear feet and date from 1966 to 1976 with additional material dating from 2003 and 2014. The papers include correspondence from Klaus Perls, Anthony Caro, Robert Gelfman and attorney Karl S. Lowenthal. Included with correspondence is a recommendation for Bradley written by Klaus Perls. The papers include photographs of Alexander Calder and his family, as well as a photograph of Bradley with Calder's work at Perls Galleries, Bradley with Kenneth Noland and Bradley with Steven Cannon. Printed material consists of a 1971 Picasso exhibition catalog and a 2014 issue of Gulf Coast. Also included are architectural plans and notes for Bradley's studio designed by John Johansen as well as personal financial information.

The papers of New York gallery owner and art dealer David Herbert measure 5.8 linear feet and date from circa 1909-1996, with the bulk of the material dating from 1945-1995. Herbert's papers document his years working for Betty Parsons Gallery, Sidney Janis Gallery, Graham Gallery, and others; the operation of the David Herbert Gallery from 1959-1962; Herbert's partnerships and agreements with Richard Feigen and others; and his activities as an independent dealer. Records include biographical material, correspondence, notebooks, subject files, artist files, exhibition files, business records, printed material, and photographs.