The papers of art historican August Jaccaci measure 7.2 linear feet and date from 1889 to 1935, with the bulk of the material dating from 1904 to 1914. The collection documents Jaccaci's work as an art historian, writer, and editor, primarily during the period he researched, compiled, and published his book Noteworthy Paintings in Private American Collections. More than one-half of the collection consists of extensive correspondence to and from many notable artists, collectors, and art historians, including John La Farge, Kenyon Cox, Isabella Stewart Gardner, and Bernard Sickert concerning the research and publication of the book. The papers also house legal files, writings and notes, art collection research files, and photographs of artwork.

The collection consists of 378 posters documenting important public service issues including education, health and safety, and cultural programs. These posters were widely displayed throughout the island and reflect key trends in the social history of Puerto Rico for nearly fifty years.

Photographs, event programs, periodicals, cassette audio tapes, correspondence, TV program scripts and pamphlets documenting Duke Ellington's career as a musician, 1924-1974, and his legacy after his death.

The Frederic G. Cassidy papers contain sound recordings and partial transcriptions; drafts of manuscripts and conference papers; and one map, all relating to his work on Jamaican and Creole lanugages.

Primarily war-related posters.

The John Gellatly letters received from artists measure 0.2 linear feet and date from 1887 to 1931. Found within the collection are 120 letters to Gellatly from Emma and Abbott H. Thayer, Frederick S. Church, Irving Wiles, Albert Pinkham Ryder, C. E. S. Wood, and George Grey Barnard. Some of the letters contain sketches, particularly those from Church. Topics include the price and progress of artworks, requests for commissions, mutual friendships, and daily events. There are also two copies of the poem "The Flying Dutchman" by Albert P. Ryder.

This collection consists of digital image scans made from ten glass negatives depicting aviation related activities in the Boston, Massachusetts, area circa 1911. The first six images are views of a homebuilt version of a Santos-Dumont 20 Demoiselle (without an engine) on the ground. The remaining four images were taken from the grandstands during the 1911 Harvard-Boston Aero Meet held August 26 through September 4, 1911; two of these provide distant views of a Burgess F (Wright Model B) Moth biplane in flight.

The James D. Smillie and Smillie family papers measure 5.6 linear feet and date from 1853 to 1957. The collection consists of the papers of four members of the Smillie family including James Smillie, his sons James David and George Henry Smillie, and George's wife, Helen 'Nellie' Jacobs Smillie. The majority of the papers are those of James D. Smillie, comprised of correspondence, forty-five daily diaries, a scrapbook, printed materials, and one etching. The papers of James Smillie consist of biographical materials and writings. The George Smillie papers include biographical materials, scattered correspondence, a scrapbook, printed materials, and photographs. The Helen Jacobs Smillie papers include corrrespondence and photographs. Also found are scattered materials relating to other family members, mostly the children of Helen Jacobs and George Smillie.

The papers of Kenyon and Louise Cox measure 0.3 linear feet and date from 1876 to 1977. Included are Kenyon and Louise's Certificate of Marriage, autobiographical notes by Louise focusing on her time at the National Academy of Design, writings, and correspondence, primarily from Kenyon Cox, including several illustrated letters. Also found is artwork by Kenyon and others, including Julian Alden Weir, biographical material on Jacob Dolson Cox, Keyon's Father, photographs and printed reproductions of artwork, magazine and newspaper clippings, an unpublished bibliography on Kenyon Cox, and a handwritten list of Kenyon Cox paintings in the National Academy of Design permanent collection.

The papers of New York, N.Y., and Washington, D.C. painter and muralist Allyn Cox measure 11 linear feet and date from 1856-1982. The collection documents Cox's personal and professional life through biographical material, family and general correspondence, writings and notes, research material, printed material, sketchbooks and loose sketches, and photographs. Photographs are of Cox at work, the Cox family, including Kenyon and Louise Cox, Cox's friends and colleagues, events, and Cox's artwork.