Answered January 12th, 2020

Since 1960, Ken Griffey Jr. has hit the most home runs by a center fielder with 350+ plate appearances in a season, with 56 home runs in 1998 and in 1997.

most hr/(sb 1) in a season 350 pa cf since 1960
Interpreted as:
most hr/(sb by a player 1) in a season 350 or more pa cf since 1960

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