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- Geological Survey (U.S.)26
- Geological Survey (U.S.), issuing body16
- National Science Foundation (U.S.)12
- Holzer, Thomas L.6
- Bakun, W. H. (William H.)5
- Prescott, W. H.5
- Rojstaczer, Stuart4
- Steinbrugge, Karl V.3
- Yashinsky, Mark3
- Çelebi, Mehmet2
- Harris, Ruth A.2
- Keefer, David K.2
- National Science Foundation (U.S.), issuing body2
- O'Rourke, T. D.2
- Reasenberg, Paul2
- Roth, Richard J.2
- Scawthorn, Charles2
- Schiff, Anshel J.2
- Simpson, Robert W.2
- United States. General Accounting Office2