Also see GURPS Mars
GURPS Mars Attacks is based on the Topps 2012 50th anniversary reprint of their original 1962 set (Mars Attacks: Heritage) and the 2013 new series Mars Attacks: Invasion.
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GURPS Wiki
Also see GURPS Mars
GURPS Mars Attacks is based on the Topps 2012 50th anniversary reprint of their original 1962 set (Mars Attacks: Heritage) and the 2013 new series Mars Attacks: Invasion.