Data runs from 1871 to present. Stats relying on play-by-play data are complete back to 1973, mostly complete back to 1950, and somewhat complete back to 1916. Please see our data coverage page for details.
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For Single Seasons, Weldon Henley pitching adjusted to the 2021 , sorted by greatest Year, Batting Park Factor: 100, Pitching Park Factor: 100
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