Expanding My Collection

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I am considering the possibility of expanding my BB HOF RC collection in the near future by around 50 cards or so (the next best group). This decision comes primarily as a result of the remaining cards that I need being either too expensive or too rare or both. In a similar manner to the way that the HOF Veterans Committee breaks down their best candidates by era, I am thinking of going with 10 individuals (including Players, Managers, Umpires, Negro Leaguers, Executives & Pioneers) from each of the following 5 eras (based on the majority of their career):

1. 19th Century (Pre-1900)
2. Pre-WWI (1900-1919)
3. WWI-WWII (1920-1945)
4. WWII-Expansion Era (1946-1969)
5. Expansion Era-Present (1970-Today)

I need to do lots of research before coming up with my candidates but thought that it would be fun to get some names from everyone as a strong concensus on some candidates can likely be reached and I can feel comfortable that at least those individuals are very worthy choices.

I look forward to hearing everyone's responses.