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Author/Creator
- Geological Survey (U.S.)4
- Arkansas Geological Commission1
- Asquith, William H.1
- Carrasquillo, Ramon A.1
- Crompton, E. James1
- Lanning-Rush, Jennifer1
- Lower Colorado River Authority1
- PeĢrez-Blair, Francisco1
- Puerto Rico Aqueduct and Sewer Authority1
- Slade, R. M.1
- United States. Bureau of Land Management1
- Westerfield, Paul W.1