A 1918 advertisement for the June issue of The American Boy magazine featuring Hall of Famer George Sisler; at the time the magazine had a circulation of nearly 300,000 and was the most popular magazine for boys in the United States.
“George H. Sisler, the cleverest youngster who ever starred in the big leagues, will tell you how to play baseball in a series of articles beginning with the June issue of The American Boy.
“In his first article he will tell you how to get and keep in condition, how to throw, how to field and how to pitch. You must read this first great article in the June issue of The American Boy, then you’ll know how helpful the ones that follow will be to you and your team.”
Also from 1918, Sisler on the Cover of Baseball Magazine
Baseball History Daily 
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