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Although more commonly known by the Space Cards designation, this 1957 card set was also issued with variant backs
identical to the original, except that the 'Space Cards' title was replaced with 'Target: Moon.' Both of these regular series cards
have blue backs, as shown here. However, Target Moon cards with salmon (pink)-colored backs can also be found; these are from a 1958
Popsicle promotion set. Blue-backed Target Moon cards are less common than Space Cards, and the salmon backs are the most difficult
to locate.
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