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1.
raster

1:100,000 Digital Raster Graphics for Maryland penn-state

2000. United States Geological Survey (USGS). A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

3.
raster

1:250,000 Digital Raster Graphics for Maryland penn-state

2000. United States Geological Survey (USGS). A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

6.
vector

Choptank River Heritage Access penn-state

2011. Choptank River Heritage Center (CRHC). Public landings and other river access points to the Choptank River and its tributaries, on Maryland's Eastern Shore.

7.
vector

Choptank River Heritage Environmental penn-state

2011. Choptank River Heritage Center (CRHC). Shows environmental education and preservation sites in or near the watershed of the Choptank River, on Maryland's Eastern Shore, that are of inter...

8.
vector

Choptank River Heritage Historic Sites penn-state

2011. Choptank River Heritage Center (CRHC). 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...

10.
vector

Choptank River Heritage Watershed penn-state

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.

12.
mixed

Landcover - Prince Georges County, Maryland penn-state

2011. University of Vermont Spatial Analysis Laboratory. High resolution land cover dataset for Prince Georges County. Seven land cover classes were mapped: (1) tree canopy, (2) grass/shrub, (3) bare eart...

13.
vector

National Hydrography Dataset (NHD) Flowline: Potomac penn-state

2004. United States Geological Survey (USGS)U.S. Environmental Protection Agency. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that m...

14.
vector

National Wetlands Inventory for Maryland penn-state

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...