Baseball Think Factory - Wikipedia
https://en.wikipedia.org/wiki/Baseball_Think_Factory
Baseball Think Factory, abbreviated as BTF or BBTF, was a sabermetrically-oriented baseball web site which featured daily news stories in baseball, with original content contributed by SABR members such as Dan Szymborski. The site was previously branded as Baseball Primer, and was created in 2001 by the founders of Baseball-Reference. Contributors who have gone on to work for Major League Baseball front offices include Voros McCracken, Carlos Gomez, and Tom Tango. Bill James
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