Burdick's T206 checklist - 521 in 1936?
This has probably been answered before, but in Leon's thread posting burdick's letters to John Wagner, Burdick references the "521" set of cards, referring to the t206 set.
This was in 1936, and he knew about wagner and plank, so what cards from our known 524 today were unknown in 1936?
522: ??
523: ??
524: joe doyle ny nat'l
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