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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. Choptank River Heritage Access
2011. ChoptankRiverHeritage.org. Public landings and other river access points to the Choptank River and its tributaries, on Maryland's Eastern Shore.
3. Choptank River Heritage Environmental
2011. ChoptankRiverHeritage.org. Shows environmental education and preservation sites in or near the watershed of the Choptank River, on Maryland's Eastern Shore, that are of inter...
4. Choptank River Heritage Historic Sites
2011. Choptank River Heritage Center (CRHC), 10219 River Landing Rd., Denton, Md 21629. Shows historic sites in or near the watershed of the Choptank River, on Maryland's Eastern Shore, that are of interest to tourism planners, histori...
5. Choptank River Heritage NRHP (National Register of Historic Places)
2011. Maryland Historical Trust (MHT). This map shows NRHP sites in the Mid-Shore counties of Kent, Queen Anne, Caroline, Talbot, and Dorchester, on Maryland's Eastern Shore. Map data wa...
6. Choptank River Heritage Watershed
2010. USDA-NRCS, 1221 College Park Drive, Suite 100, Dover, DE 19904. Shows watershed of the Choptank River and its tributaries, on Maryland's Eastern Shore.
7. National Hydrography Dataset (NHD) Flowline: Potomac
2004. U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency, USDA Forest Service, and other Federal, State and local partners (see dataset specific metadata under Data_Set_Credit for details). The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that m...
8. National Wetlands Inventory for Maryland
2009. U.S. Fish and Wildlife Service. This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the conterminous United States. These data...
9. 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.
10. Stratification of Maryland: Pennsylvania: Pennsylvania
2002. United States Department of Agriculture, National Agricultural. The United States Department of Agriculture (USDA), National Agricultural Statistics Service (NASS) area sampling frame is a delineation of all par...