It's odd that there are two different reprints. You wouldn't think there would be that much demand. Don't know if yours is from 1977, but that certainly is a reasonable possibility.
In 1988 Horton issued a 31 volume reprint set that included a complete run of Spalding Guides from 1876-1905, plus an 1890 Player's League Guide. That's where my copy originates. Yours apparently is different.
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