Answered January 12th, 2020

Since 1900, Ty Cobb has the best slugging percentage with 502+ plate appearances with <10 home runs in a season, with a slugging percentage of .621 in 1911.

highest slg by a player in a season since 1900 with 502 pa and fewer than 10 hr
Interpreted as:
highest slg by a player in a season since 1900 with 502 or more pa and fewer than 10 hr

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