One of Hal Richman’s early cards that became Strat-o-Matic, back when the randomizer was playing cards, not dice (ca. 1955)
An example of George Lindsey’s tally sheets, which counted base-out situations from games he listened to on the radio (ca. 1955)
One of the pages from Earnshaw Cook’s incomprehensible masterpiece, “Percentage Baseball” (1964)