I've only been collecting since the early 1970s. Back in that time info on errors was word of mouth. It was hobby lore you'd acquire from "talking" with people at "card shows"; alien concepts, I know. And once you knew of a variation you'd hunt them down relentlessly and see how many you could grab up. My first list of variations and errors was in The Complete Book of Baseball Cards vy Steve Clark (1975).
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