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Water-resources investigations in Pennsylvania : programs and activities of the U.S. Geological Survey, 1990-91
- "Programs and activities of the U.S. Geological Survey, 1990-91"@en
- "Water-resources investigations in Pennsylvania : programs and activities of the U.S. Geological Survey, 1990-91"@en
- "Water-resources investigations in Pennsylvania programs and activities of the U.S. Geological Survey, 1990-91"@en