Titlebook: Astrophysics and Space Science; Volume 255, 1997/199 John Dyson,Susan A. Lamb,P. A. Zaal Book 1998 Springer Science+Business Media New York

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PDRs and Shocks in S106 IR and Cep A Easts. The infrared spectrum of S106 IR is dominated by PDR emission while that of Cep A East has a large shock component. We suggest that the difference between these two objects could reflect an evolutionary trend.