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- Piper, David Z.✖[remove]18
- Geological Survey (U.S.)8
- Medrano, M. D.7
- Geological Survey (U.S.), issuing body4
- Isaacs, Caroline M.4
- Bischoff, James L.2
- Dean, Walter E.2
- Havach, George A.1
- Hein, James R.1
- Keller, Margaret A.1
- McIntyre, Brandie R.1