American Association of Petroleum Geologists

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University of Oklahoma professor. General correspondence (1911-1957); papers (1923-1950) of the University of Oklahoma chapter of the geology fraternity, Sigma Gamma Epsilon; correspondence (1925-1942), membership lists, and expense records (1934-1935) from the Oklahoma Academy of Science; manuscripts, reprints and research correspondence (1932-1934, n.d.) from Decker's research on Oklahoma geology and on graptolites; correspondence (1925-1946) and notebooks (n.d.) concerning the Methodist Episcopal Church in Norman, Oklahoma; correspondence and printed material (1931-1952) concerning the University of Oklahoma; and correspondence and printed material (1913-1955) from various universities and geological associations. Charles Elijah Decker Photograph Collection also in repository.

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Petroleum geologist. Correspondence (1950-1977) between Dan H. Carpenter and Everett Carpenter's associates regarding Everett's fiftieth anniversary as a petroleum geologist. Of particular interest are letters between E. Carpenter and his associates concerning the history of petroleum geology. Other materials include E. Carpenter's Bachelor of Arts in Geology thesis (1911), and various American Association of Petroleum Geologists publications.