You searched for: Dc Creator Sm United States Geological Survey (USGS) Remove constraint Dc Creator Sm: United States Geological Survey (USGS) Dc Publisher Sm State of Pennsylvania Remove constraint Dc Publisher Sm: State of Pennsylvania Dc Rights S Public Remove constraint Dc Rights S: Public Dc Type Sm Dataset Remove constraint Dc Type Sm: Dataset Time Period 1950-1999 Remove constraint Time Period: 1950-1999

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