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.

The Dodie Kazanjian and Calvin Tomkins research materials on Alexander Liberman measures 7.8 linear feet and date from 1927-1999. The collection contains sound recordings of interviews, interview transcripts, correspondence, biographical material, clippings, and some photographs. The papers and recordings were predominantly compiled during Kazanjian and Tomkin's preparation for their book, Alex: The Life of Alexander Liberman (1993).

The papers of writer and art critic Dodie Kazanjian measure 14.1 linear feet and 0.546 GB, and date from 1949-2017, bulk 1980-2017. The collection is comprised of writings, interviews, and research material related to Kazanjian's career as an art writer for Vogue and House and Garden magazines. Included are manuscripts, correspondence, notes, printed material, photographs of artwork, and interviews with various artists and art world figures. The interviews were conducted by Kazanjian as part of her research process and were recorded on over 230 sound cassettes found in the collection. Many of the interviews are also transcribed. A small amount of born-digital material includes images of artworks and artists and audio recordings of interviews.

The records of the Fendrick Gallery measure 106.4 linear feet and 0.008 GB and span the years 1952 to 2001. The bulk of the collection is comprised of artist's files that document the gallery's relations with and representation of over 300 contemporary artists and sculptors, including Robert Arneson, William Bailey, Daniel Brush, Wendell Castle, Robert Cottingham, James Drake, John Dreyfuss, Walter Dusenbury, Roger Essley, Helen Frankenthaler , Sam Gilliam, Jasper Johns, Raymond Kaskey, Claude and Francois Lalanne, Albert Paley, Joseph Raffael, Carol Summer, and numerous other artists. Also found are subject, exhibition, commission, administrative, and financial files, as well as files documenting the gallery's relationship with other museums and galleries.

The papers of art historian, curator, and professor Robert Rosenblum measure 38.3 linear feet and 1.17 GB and date from circa 1927 to 2009, with the bulk dating from 1950 to 2006. They include biographical material, extensive personal and professional correspondence; lectures, writings, and writing project files by Rosenblum and others; exhibition files; research reference files; teaching files; personal business records; printed and digital material; photographs; and artwork.

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.

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.