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Books about Deygas:
Gas Book 23: Kuntzel And Deygas (Bk. 23) by KUNTZEL + DEYGAS (Jun 10, 2006)
Kuntzel and Deygas (Design & Designer) (French Edition) by Jean Aittouares (May 2006)
Design & Designer 47 Kuntzel Deygas by Design & Designer (1990)