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Gamma World: Mutants and Machines (Gamma World d20 3.5 Roleplaying), by Wendig, Chuck, O'Duffy, Patrick, Hanrahan, Gareth, Bolack, David
Referee's Screen and Mini-Module (Gamma World RPG 1st edition), by Paul Reiche III
The Cleansing War of Garik Blackhand (Gamma World Adventure GW3), by Garry Spiegle,Michael Price