Assessment of Hydrologic Trends in Pennsylvania

The U.S. Geological Survey (USGS) in cooperation with the Pennsylvania Department of Conservation and Natural Resources (PA DCNR), Bureau of Geological Survey,...美国地质调查局（U.S. Geological Survey, USGS）与宾夕法尼亚州保护与自然资源部（Pennsylvania Department of Conservation and Natural Resources, PA DCNR）地质调查局（Bureau of Geological Survey）合作……