On August 28, 1969 — At a press conference, Commissioner Bowie Kuhn announces the publication of The Baseball Encyclopedia and holds up a copy of the 6 1/2 pound book.

The original version of the Baseball Encyclopedia Belts a Statistical Grand Slam; 2,337 – Page Volume Offers 17 Columns on Each Batter

The book that eclipses anything published on the subject before was unveiled yesterday at a press conference in Mamma Leone’s Restaurant, with the blessing of Commissioner Bowie Kuhn and the proud expectations of Information Concepts, Inc., the editors, and the Macmillan Company, the publishers.

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Sources:
Baseball Reference August 28
National Pastime August 28
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game