A New York bookseller, Warshaw assembled this collection over nearly fifty years. The Warshaw Collection of Business Americana: Police 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

The papers of sculptor Hiram Powers measure 12.4 linear feet and date from 1819 to 1953, with the bulk of the material dating from 1835 to 1883. Over two-thirds of the collection consists of Powers' correspondence with business associates, purchasers of his artwork, and numerous friends in the United States and Florence, Italy. Of note is Powers' "Studio Memorandum," from 1841 to 1845, which contains dated notations of letters written, receipts and expenditures, business contacts, works in progress, commissions and price quotations for work, comments on problems encountered during studio work, and other notes. Additional papers include scattered biographical material, financial and legal records, printed materials, photographs of Powers, his family, artwork, as well as an extensive collection of carte de visite and cabinet card portraits of many notable figures. Also found is a small amount of artwork by Powers and others, a scrapbook, and two autograph and memorabilia albums.

The papers of Los Angeles Abstract Classicist painter and educator Frederick Hammersley measure 35.05 linear feet and date from circa 1860-2009, bulk 1940-2009. The papers contain biographical materials, 32 diaries, family and professional correspondence, personal business and financial records, estate records, writings, graphic design projects, teaching files, printed materials, scrapbooks, photographs, and works of art. There is a 0.3 linear foot unprocessed addition to this collection donated in 2020 that includes photographs of Hammersley's family, and most significantly for research, a study in pencil and a "model for making cubes," a paper document that can be stored flat and folded into a cube shape.

The records of nationally renowned Boston, Massachussetts, stained glass design company, Wilbur H. Burnham Studios, measure 38.5 linear feet and date from circa 1904-1991. The majority of the collection consists of project files for the studio's stained glass window contracts throughout the United States from the 1920s-1980s. In addition to project files, records include biographical material for the owners, correspondence relating to personal and studio business, general business and financial records, writings such as published articles by Wilbur H. Burnham, scrapbooks and other printed material documenting the history of the company, artwork including extensive watercolor design studies for stained glass, and photographic material. There is a 2.6 linear foot unprocessed addition to this collection donated in 2021 that includes includes awards, printed material, passports, biographical material, Christmas cards, photographs, slides and postcards of stained lass windows, posthumous material, a bound ledger, legal papers, invoices and receipts, project files and glass plate negatives. Materials date from circa 1901-1991.

The Charlene Hodges Byrd collection measures 43 linear feet, and dates from circa 1750-2009, with the bulk of the material dating from 1880-1960. The collection documents the personal life and professional career of Charlene Hodges Byrd, an African American teacher from Washington, D.C., along with material for several related families from Pennsylvania, Maryland, and Washington, D.C. Family members prominently represented include Sarah A. Shimm, teacher and essayist under the name Faith Lichen; her daughters Erminie F. Shimm and Grace E. Shimm Cummings, both teachers; and Byrd's mother, Joyce Ethel Cummings Hodges, also a teacher. Correspondence and writings chiefly discuss family life, religion, race, education, and the relationship with Frederick Douglass and his family. The collection is arranged in 10 series: Biographical Material, Correspondence, Writings, Subject Files, Financial and Legal Records, Printed Material, Volumes, Memorabilia, Textiles, and Photographs.

Collection documents Sims's activities as a traveler and his interest in historic restoration. It includes forty-one notebooks, 6,000 color slides, a smaller number of photographic prints, forty-one stereo view cards, and three boxes of personal papers and ephemera. While some images are personal, the majority form a documentary record of various subjects and places and provide biographical information on Sims.

The collection of artists' letters compiled by Mary and John McGuigan Jr. measure 0.6 linear feet and date from 1794-1938. The collection is comprised of a group of letters, writings, and signed documents to and from a variety of artists, art administrators, art critics, historians, and art-related organizations assembled from multiple sources. It also includes associated printed material with some documents and a few photographs, including carte de visites and cabinet cards.

The papers of southern California Pop artist Billy Al Bengston measure 10.4 linear feet and date from circa 1940s to 1989, with the bulk of the materials dating from 1960 to 1988. The collection documents the life and work of the artist through biographical materials, correspondence, personal business records, gallery and museum files, teaching files, project and commission files, scattered artwork, printed materials, and photographs.

A collection of promotional photographs and press kits used to promote motion pictures and made for television motion pictures and other entertainment.

This collection consists of 277 images taken by or acquired by Slim Lindsay during his stints as manager of the Curtiss Wright and Roosevelt Fields, and during his travels for the B.G. Corporation.