The collection documents in photographs, scrapbooks, notebooks, correspondence, stock ledgers, annual reports, and financial records, the evolution of the telegraph, the development of the Western Union Telegraph Company, and the beginning of the communications revolution. The collection materials describe both the history of the company and of the telegraph industry in general, particularly its importance to the development of the technology in the nineteenth and twentieth centuries. The collection is useful for researchers interested in the development of technology, economic history, and the impact of technology on American social and cultural life.

The records of Holly Solomon Gallery, a New York City gallery specializing in contemporary American art, measure 200.6 linear feet and date from circa 1948-2003. The gallery's activities are documented through dealer files, subject files, artists' files, inventories, sales and loan records, administrative and financial records, printed materials, photographic materials of artwork and exhibitions, sound, video, and film recordings, and scattered electronic records. Also found are records of the alternative space, 98 Greene Street Loft, as well as Holly Solomon's personal papers.

John Matthew Miller III (born June 3, 1896) was active in aviation throughout his life, as a naval aviator, air mail pilot, transport pilot, autogiro pilot, flight instructor, aircraft manufacturer, airport operator, agricultural pilot, and helicopter test pilot, working at different times for the United States Navy, the U.S. Aerial Mail Service, Pitcairn Aeronautical Corporation, and the U.S. Department of Agriculture; from 1927-1929 Miller operated his own business, the Miller Aviation Corporation of New Brunswick, New Jersey. The collection includes Miller's pilot licenses and log books, scrapbooks, photographs, newspaper clippings and assorted ephemera, predominantly from the 1914 to 1939 period of Miller's life.

The papers of art critic, writer, and historian Elizabeth McCausland measure 45 linear feet and date from 1838 to 1995, with the bulk of the material dating from 1920 to 1960. The collection provides a vast accumulation of research data on various artists and aspects of American art, especially the early American modernists and the Federal Arts Projects. Papers include McCausland's extensive research and writing files, particularly on Marsden Hartley, E. L. Henry, Lewis Hine, George Inness, and Alfred H. Maurer. McCausland's correspondence with artists includes a substantial amount with Arthur Dove and Alfred Stieglitz. Her collaborative work with Berenice Abbott on the Changing New York book and series of photographs is well-documented within the collection. Also found are general writings, subject files, files relating to exhibitions, teaching, and committees, photographs, art work, personal papers, and printed material. Additional McCausland material donated later from the estate of Berenice Abbott include biographical materials, project files, writings, and printed materials.

The Smithsonian Institution Festival of American Folklife, held annually since 1967 on the National Mall in Washington, D.C., was renamed the Smithsonian Folklife Festival in 1998. The materials collected here document the planning, production, and execution of the annual Festival, produced by the Smithsonian Center for Folklife and Cultural Heritage (1999-present) and its predecessor offices (1967-1999). An overview of the entire Festival records group is available here: Smithsonian Folklife Festival records.

The papers of painter Audrey Flack measure 15.8 linear feet and 0.897 GB and date from 1950-2009. The collection documents Flack's career as an artist through biographical material, correspondence, extensive project files, writings and notes by Flack and others, exhibition catalogs, news and magazine clippings, other printed and digital material, and scrapbooks. Also found are photographs by Audrey Flack as well as photographs of the artist and works of art.

The papers of artist and art patron Dorothea A. Dreier measure 2.6 linear feet and date from 1881-1941, with the bulk of the material dating from 1887-1923. The papers document the life and work of Dorothea Dreier and also contain the papers of and about members of her immediate family, particularly her sisters, Mary and Katherine Dreier, and Margaret Dreier Robins. Found are correspondence, printed materials, legal and financial records, photographs, and one sketchbook by Dreier.

A New York bookseller, Warshaw assembled this collection over nearly fifty years. The Warshaw Collection of Business Americana: Accounting and Bookkeeping forms part of the Warshaw Collection of Business Americana, Subseries 1.1: Subject Categories. The Subject Categories subseries is divided into 470 subject categories based on those created by Mr. Warshaw. These subject categories include topical subjects, types or forms of material, people, organizations, historical events, and other categories. An overview to the entire Warshaw collection is available here: Warshaw Collection of Business Americana

This collection consists of six feet of material documenting Porter's many scientific contributions. The following types of material are included: photographs, lecture notes, correspondence, trip notes, newspaper clippings, symposium programs, papers, and periodicals, circa 1930s-1980s.

The papers of art collector Emily Hall Tremaine measure 8.9 linear feet, date from circa 1890 to 2004, and document the development of Tremaine's seminal collection of modernist, pop, and contemporary art. The papers comprise biographical material including a sound recording, personal correspondence, art collection files, artist files, exhibition loan files including a video recording, and reproduction request files. Also found are two scrapbooks documenting Tremaine's first marriage to Baron Maximilian von Romberg; and photographs of Tremaine, her family and friends, and works of art from her collection.