On the back of the cards, check to see if his address (18 Engle St. Tenafly, NJ) appears under the 1967 "R. G. Laughlin" copyright info. The general rule of thumb is the 'original' cards included his address and the reprints omitted it, but my research is bringing up some interesting questions of whether or not later reprinting(s) did indeed feature his address before it was ultimately eliminated for good.
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