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Emmons W H, Stauffer C R & Thiel G A. (1955). Geology: Principles and processes. : .
Emmons W H, Stauffer C R and Thiel G A. 1955. Geology: Principles and processes. : .
Emmons W H, Stauffer C R and Thiel G A. (1955). Geology: Principles and processes. : .
Emmons W H, Stauffer C R and Thiel G A. Geology: Principles and processes. : . 1955.