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.

A collection of various documents relating directly to a ballpark. Documents such as correspondence, seating capacity, blueprints, ground rules, and ticket prices.

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

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.

This is a collection of National League minutes from 1876, 1899 to 1966 and financial ledgers from 1902 to 1995. There is American League financial information in three of the ledgers. This collection also includes 17 recorded disks which have the game broadcasts of three games.

These organizational records include annual reports, minutes, rules, financial material, memorandums, and other sundry items illustrating minor league baseball history in Illinois, Indiana, Iowa, and other Midwestern states from 1937 through early 1962.