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- Geological Survey (U.S.)6
- Carter, Virginia4
- Rybicki, Nancy B.4
- Geological Survey (U.S.), issuing body3
- Bartow, Nancy C.2
- Gammon, Patricia T.2
- Schenk, Edward R.2
- Bartow, Nancy1
- Campbel, Sarah Hunter1
- Campbell, Sarah Hunter1
- Paschal, James E.1
- Ruhl, Henry A.1