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1. Aquatic Mollusk sampling points Plummers Island: Pennsylvania

2004. Ryan Evans, Pennsylvania Natural Heritage Program - Pittsburgh office. April 2004 freshwater snail sampling points around Plummer's Island, Montgomery County, Maryland.

2. Snail Sampling points Plummers Island: Pennsylvania

2005. Ryan Evans, Pennsylvania Natural Heritage Program - Pittsburgh office. April 2004 freshwater snail sampling points around Plummer's Island, Montgomery County, Maryland.