Memorabilia from the International Exhibition of Modern Art in 1913, commonly known as the Armory Show, measures 0.02 linear feet and includes one button, two invitations, and 54 postcards primarily from the New York installation and also a few from the installations in Boston, Massachusetts and Chicago, Illinois.

The Joseph Hirshhorn papers regarding the Elmer MacRae papers measure 0.6 linear feet and date from 1959 to 2012, with the bulk of the material dating from 1960 to 1975. The papers relate to Joseph Hirshhorn's acquisition of the Elmer MacRae papers, as well as their subsequent use in the 50th anniversary exhibition of the Armory Show and for Milton Brown's book, The Story of the Armory Show. The collection includes correspondence, exhibition files, loan forms, rights and reproductions forms, and photographs.

The Elmer Livingston MacRae papers related to the Association of American Painters and Sculptors, Inc., (AAPS) measure 1.8 linear feet and date from 1899 to circa 2013, with the bulk of the material dating from 1912-1916. Elmer Livingston MacRae served as Treasurer of the AAPS when the association organized the International Exhibition of Modern Art, also known as the Armory Show of 1913. The bulk of this collection concerns MacRae's involvement with the AAPS and the Armory Show and includes administrative files, correspondence, exhibition files, financial records, printed materials, and artifacts.

The papers of painter and educator Edwin Ambrose Webster measure 2.2 linear feet and date from 1821 to 1968. Found within the papers are biographical material; business and personal correspondence; writings; teaching and research files, including information on Webster's participation in the 1913 Armory show; printed material; artwork; and photographic materials of Webster, his family and friends, and his work.

The papers of curator, art historian, and author Judith Zilczer measure 0.4 linear feet and date from 1910-1995, with the bulk of material dated 1973-1995. The papers contain project files and related correspondence, unpublished manuscripts, photographs, and printed material documenting her research as an independent art historian.

The Walt Kuhn Family papers and Armory Show records measure 31 linear feet and date from 1859 to 1984, with the bulk of material dating from 1900 to 1949. Papers contain records of the legendary Armory Show of 1913, also known as the International Exhibition of Modern Art, which introduced modern European painting and sculpture to the American public. Papers also contain records of the Association of American Painters and Sculptors (AAPS), the artist-run organization that mounted the Armory Show; records of the New York artists' clubs the Kit Kat Club (founded 1881) and the Penguin Club (founded 1917); and the personal and family papers of New York artist Walt Kuhn (1877-1949), one of the primary organizers of the Armory Show.

The papers of painter and illustrator F. Luis Mora measure 1.7 linear feet and date from 1891 to 1986, with the bulk of material dating from 1891 to 1922. The collection includes biographical information, correspondence, 242 monthy pocket diaries by Mora, and printed and photographic materials.

The papers of Washington, D.C. painter Margaret Casey Gates date from 1934-1988, and measure 1.0 linear foot. Gates' papers document her work as a painter, her projects for the New Deal federal arts programs, the Phillips Memorial Gallery and its art school, where she attended school and later worked as secretary and where her husband Robert Franklin Gates was a teacher, and the Washington, D.C. arts scene. Found are scattered correspondence, seven sketchbooks by Gates and two sketchbooks of her divorced husband Robert Franklin Gates. Miscellaneous notes and writings, a scrapbook, printed material, and photographs of Gates, her husband, friends, artwork, and views of the Virgin Islands are also included in the papers.

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.

The Colin de Land collection measures 15.15 linear feet and 0.901 GB and dates from 1968 to 2008, with the bulk of the collection dating from the early 1980s through 2003. The majority of the collection consists of photographic material, primarily snapshots, documenting daily life in and around de Land's gallery American Fine Arts, Co., as well as de Land's pesonal life and affairs. There are candid photographs of exhibition openings, day-to-day gallery operations, art fairs, vacations, social gatherings, and New York City street scenes. Also included are some personal objects belonging to de Land and his wife Pat Hearn, as well as two scrapbooks containing items once decorating the walls of de Land's office at American Fine Arts. The collection includes video recordings documenting trips to Cape Cod, Hearn's illness, and occasional art world events.