Members of The Society for American Baseball Research get free access to HeritageQuestOnline and the ProQuest Historical Newspaper Database. Ancestry.com members, on the other hand, have access to Professional Baseball Players, 1876-2004:
This database is an index to over 15,000 professional baseball players who played between 1876 (the year the National League was founded) and 2004. Information listed in the index for each individual includes their first and last names, birth first and last names, nickname, birth date, birthplace, death date, death place, college attended, height, weight, date of first game, date of final game, how bats, how throws, and date and round drafted. Additionally, many of the individuals who played between 1887 and 1938 have images associated with them, showing either a photograph or baseball card.Unfortunately, the only baseball player mentioned in the database description is a man children in New England are born to despise.
Players are listed in the browse table by their popular names, not their birth names. For example, Bucky Dent is listed as "Bucky Dent", not as his given name "Russell Earl O'Dey." To browse the images first select a first letter of a last name in which you would like to search, followed by the last name, and finally the full name of the individual.