Answered January 12th, 2020

Doug Allison had 3 plate appearances when slugging .420 or better, batting of .325 or above and slugging .650 or better in 1883.

.325 avg,.420 slg,.650 slg by a player in a season wtuh 502 pa
Interpreted as:
.325 or higher avg,.420 or higher slg,.650 or higher slg by a player in a season wtuh 502 pa

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