by Geological Survey (U.S.), Katherine Fitzpatrick-Lins, Keith A. Kvenvolden, L. Imogene Doher, Peter A. Scholle, Phoebe L. Hauff, Robert W. Fleming, United States. Bureau of Mines, United States. Interagency Oil and Gas Supply Project, Valerie A. Milazzo, Fred A. Taylor, Joseph Airey, Mark A. McMenamin

1949