Papers include Kagan's correspondence, photographs, printed materials and audio tapes. All letters in the collection date from 1938-39, when he had moved his Petropolis operations to Brussels; there are items by Vladislav Khodasevich, Vladimir Nabokov, and Mikhail Osorgin, and others. Among the photographs are pictures of Ivan Bunin, Konstantin Fedin, and Evgeniĭ Zami︠a︡tin. Printed materials consist chiefly of books published by his firms; some of the books are inscribed, for example by Nikolaĭ Berdi︠a︡ev and Lev Karsavin. Included is a lengthy taped interview of Kagan by Marc Raeff in which Kagan discuses his life and publishing activities.

Maurice Peress (1930-2017) was an American orchestra conductor, arranger, author, and educator. The papers include audio and video recordings, clippings, contracts, correspondence, diaries, memorabilia, notebooks, photographs, posters, programs, research materials, reviews, scores, scrapbooks, and working files, sketches, and other materials.

The M. Watt Espy papers chronicle the extensive research efforts that led to the creation of the Capital Punishment Research Project and the database known as the Espy File. Espy spent three decades gathering and indexing documentation of legal executions in the United States. His papers contain both primary and secondary sources used to catalog thousands of instances of capital punishment in the United States and its territories since the 1600s. The collection includes material from corrections records, newspapers, county histories, legal proceedings, and books. In addition to the records pertaining specifically to the death penalty, there is also a selection of magazines collected by Espy that cover true crime stories as well as life in the American Old West.

The Victor Streib Papers contain research materials and legal case files on the death penalty in the United States with a focus on how it has been applied to women and juveniles.

The Vincent J. Schaefer Papers represent the professional accomplishments and personal interests of the scientist who discovered cloud seeding. Schaefer spent more than 20 years with General Electric in Schenectady, New York, working his way up from apprentice, to research assistant, to research associate. In those years he was mentored by Irving Langmuir, Nobel Prize winner in chemistry. The work Schaefer did at General Electric laid the foundation for further success as he became director of research for the Munitalp Foundation, began a highly successful summer science program for high school students, acted as an independent consultant, and founded the Atmospheric Sciences Research Center at the State University of New York at Albany. This collection contains research data, notes, correspondence, publications, and photographs that showcase Schaefer's long, industrious scientific career as well as highlighting his many hobbies in local history and environmentalism.