The papers of painter and writer James Britton measure 2.9 linear feet and date from circa 1905-1984, with the bulk of the material dating from circa 1905-1935. The bulk of the papers consist of 49 diaries dating from 1918-1935, plus notebooks of diary excerpts, that chronicle Britton's daily activities and include lists, illustrations, and drafts of correspondence. Additional papers include biographical information compiled by the Britton family; scattered business and financial records; correspondence, including copies of Britton's letters to the editors of the Hartford Courant and the Hartford Times; additional writings and notes that include drafts and manuscripts of an autobiography, drafts of articles for his publication Art Opus, and other writings; sketches and a woodcut print; printed materials, including clippings of his published writings for Art Review International, Book Notes, and Opus; and one photograph of Britton and of works of art.

The papers of museum director, professor, writer, and post-World War II Monuments Men Andrew Carnduff Ritchie measure 10.3 linear feet and date from 1907 to 1983. Found within the papers are biographical material, including materials and photographs concerning his military service in the Monuments, Fine Arts, and Archives Section of the U.S. Army; correspondence, including letters from numerous artists; writings; committee and organization files; exhibition and project files, teaching files; printed material; and photographs, including portrait images of Ritchie taken by Hans Namuth.

This collection documents the career of Lester Beall, graphic designer and commercial artist from approximately 1933-1967.

Personal papers of Robert O. Muller, a Connecticut-based art dealer and collector who, over the course of seventy years, assembled one of the world's finest collections of Japanese prints from the late 1860s through the 1940s. The papers include Muller's correspondence relating to Japanese art, files relating to his and his wife's 1940 honeymoon in Japan during which he forged many contacts with Japanese artists and art dealers and purchased thousands of prints, subject files, catalogs, business transactions, magazine and newspaper clippings, photographs, and notes and drafts for a planned book.

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 curator Riva Castleman measure 10.6 linear feet and 7.83 GB, and date from 1930-2013 with one printed item dating from 1871. The collection contains biographical material, correspondence including mail art, writing project files, notebooks, interviews, project files, printed material, photographic material, and artwork. The collection richly documents Castleman's writing and research process and contains dozens of manuscripts for books, catalogs, and essays, as well as related correspondence and research including audio interviews and sound recordings. Several of Castleman's books about contemporary printmaking, such as Prints of the 20th Century (1976) and American Impressions (1985), are extensively documented, as are many of the catalogs she produced to accompany Museum of Modern Art exhibitions, including Jasper Johns: A Print Retrospective (1987) and The Prints of Andy Warhol (1990). Some records are in born-digital form including correspondence, manuscript drafts, and audio conversations with Tatyana Grosman. Other interviews are on sound cassettes.

The papers of Southern California architectural historian, critic, and writer Esther McCoy measure 44.4 linear feet and date from 1876 to 1990 (bulk 1938-1989). The collection documents McCoy's career, as well as her family and personal life through biographical material, extensive correspondence, personal and professional writings, project files, Southern California architects' files, clippings and other printed material, a large collection of photographs and slides, and taped interviews of Southern California modern architects.

The papers of sculptor and educator Tom Doyle measure 5.2 linear feet and date from 1956-2014. The collection contains biographical material, correspondence, commission files, printed material, and four sketchbooks.

The Marcel Breuer papers, 1920-1986, contain biographical material, correspondence, business and financial records, interviews, notes, writings, sketches, project files, exhibition files, photographs, and printed material that document the career of architect and designer Marcel Breuer.

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.