Roger G. Walker

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1	Memorial to Francis J. Pettijohn 1904–1999 PAUL EDWIN POTTER Department of Geology, University of Cincinnati, Cincinnati, Ohio[removed]His life spanned most of the 20th century and he influenced many. By the time he fini Add to Reading List Source URL: rock.geosociety.org Language: English - Date: 2008-06-18 12:14:48 Johns Hopkins William C. Krumbein Academia Roger G. Walker Johns Hopkins University Francis J. Pettijohn Geology