A collection consisting of correspondence, contracts, souvenir programs, postcards, and tickets. This dates between 1894 and 1959 and primarily relates to the Philadelphia Athletics.

The collection is comprised of press kits, newspaper and magazine clippings, detailed statistics, post-season media guides, programs, and correspondence.

A collection of contracts, assignment and transfer agreements between individual players, umpires, and scouts and baseball clubs or leagues, dated between 1870 and 1988.

This collection, created and compiled by Barney Dreyfuss and William Benswanger, is comprised primarily of correspondence and agreements. As well as rosters, programs, and financial information.

The collection documents George Weiss' tenure with the New York Yankees minor and major league organizations from 1932 to 1960 and the New York Mets major league organization from 1961 to 1966. It includes financial records, player reports, ticket files, correspondence, clippings, personnel files, scouting evaluations, ephemera, tour files, marketing and promotion files, and personal documents.

A collection of correspondence, contracts, photographs, and ephemeral items relating to Lou Novikoff.