Records of the American League Base Ball Club of New York and its minor league affiliates, consists almost exclusively of business and financial records, some of which date back to the earliest days of the Yankees organization.

This collection contains correspondence, financial reports, and photographs of J.A. "Bob" Quinn's career in baseball.

This is a collection of correspondence, court documents and newspaper clippings relating to the lawsuits against A.B. Chandler et al. and the New York Yankees.

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

A collection of correspondence, office files, financial records, player files, scout files, and files related to minor league affiliates of the Detroit Tigers. These files range from 1934 to 1980.

A collection of game accounts, rosters, standings, and statistics relating to the New England League as researched and compiled by Dick Thompson.

A collection of correspondence, articles, research notes, and clippings created and compiled by Dick Thompson, primarily related to baseball in New England.

A collection of 148 scorecards kept by baseball fan George Goetz between 1939 and 1956.

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 relating to the Re-entry Draft, Rule 4 Draft, and Rule 5 MLB Draft selections, and signings of players between 1968-1998.