Answered January 12th, 2020

Willie Mays went deep 51 times when collecting 100+ RBI and stealing 20+ bases in 1955.

50 hr, 100 rbi, 20 sb by a player in a season before 2017
Interpreted as:
50 or more hr, 100 or more rbi, 20 or more sb by a player in a season before 2017

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