Bush League by Robert Obojski (1975). The best book on the formation and history of the minor leagues. Important figures like Branch Rickey, Frank Shaughnessy, George Weiss and Hank Peters are featured as well as great players like Joe Hauser, Ike Boone and Jigger Statz.

Encyclopedia of Minor League Baseball edited by Lloyd Johnson & Miles Wolff. Most comprehensive work on the minors. All of the leagues, cities and league leaders from 1902 are included as well as standings, attendance, managers and post-season results.

The Minor League Register edited by Lloyd Johnson (1995). A compilation of the three volumes of SABR's Minor League Baseball Stars, which compiles year-by-year records of the more prominent players in minor league history. Over 200 new entries have been added.

Runs, Hits and an Era: The Pacific Coast league, 1903-58 by Paul J. Zingg and Mark D. Medeiros (1994). Fully illustrated.

The American Association: A Baseball History, 1902-1991 by Bill O'Neil (1992). Detailed coverage with many photographs. Eakin Press.

The International League: A Baseball History, 1884-1991 by Bill O'Neil (1992). Detailed coverage with many photographs. Eakin Press.

The Pacific Coast League 1903-1988 by Bill O'Neil (1990). Detailed coverage with many photographs. Eakin Press.

The Southern League: Baseball in Dixie, 1885-1994 by Bill O'Neil (1994). Detailed coverage with many photographs. Eakin Press.

The Texas League: A Century of Baseball by Bill O'Neal (1987). Detailed coverage with many photographs. Eakin Press.