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Author/Creator
- Geological Survey (U.S.)118
- Jillson, Willard Rouse, 1890-197544
- Kentucky Geological Survey43
- Petroleum Economist Ltd28
- Kentucky Geological Survey, issuing body25
- United States. Central Intelligence Agency18
- Hudnall, James S.14
- West Virginia Geological and Economic Survey14
- Burles, D. A.13
- Mardirosian, Charles A.11
- Kansas Geological Survey9
- A. Hoen & Co., printer8
- White, I. C. (Israel Charles), 1848-19278
- Theis, C. V.7
- Williams & Heintz Co., printer7
- De Witt, Wallace, Jr., 1920-20126
- Merriam, Daniel F. (Daniel Francis), 1927-20176
- Oilfield Publications Limited6
- South Dakota Geological Survey6
- Withers, Spencer6