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Breeding Bird Atlas: Pennsylvania penn-state

1994. Daniel W. Brauning and F. B. Gill and Pennsylvania Game Commission. Part of the Pennsylvania Gap Analysis Project the Breeding Bird Atlas database indicates bird species and nesting behavior of known birds species i...


National Fish Hatcheries in Pennsylvania penn-state

1996. Environmental Resources Research Institute. Boundaries of fish hatcheries on 1:24,000 USGS topographic maps, locations verified from the National Park Service list.