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- Geological Survey (U.S.)1,110
- SpringerLink (Online service)514
- Geological Survey of Great Britain124
- Geological Society of America104
- International Geological Congress (28th : 1989 : Washington, D.C.)98
- Geological Society of London95
- American Geophysical Union88
- Geological Survey of Canada88
- British Geological Survey68
- Jillson, Willard Rouse, 1890-197565
- ebrary, Inc62
- Darwin, Charles, 1809-188253
- Museum of Practical Geology (Great Britain)50
- American Geological Institute45
- Geological Association of Canada40
- Geological Society of America, issuing body39
- State Geological and Natural History Survey of Connecticut38
- American Association of Petroleum Geologists37
- Ohio. Division of Geological Survey37
- Lyell, Charles, Sir, 1797-187535