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1.
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Zebra Mussel Distribution: United States penn-state

2008. United States Geological Survey (USGS). The concern caused by the explosive spread of the zebra mussel, (Dreissena polymorpha), within the United States resulted in passage of the Nonindi...

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Chesapeake Bay Watershed Land Cover Data Series 1984 penn-state

1984. United States Geological Survey (USGS). To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

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Chesapeake Bay Watershed Land Cover Data Series 1992 penn-state

1992. United States Geological Survey (USGS). To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

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Chesapeake Bay Watershed Land Cover Data Series 2001 penn-state

2001. United States Geological Survey (USGS). To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

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Chesapeake Bay Watershed Land Cover Data Series 2006 penn-state

2006. United States Geological Survey (USGS). To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...

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1:100,000 Digital Raster Graphics for Delaware 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...

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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...

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1:100,000 Digital Raster Graphics for Virginia 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...

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1:100,000 Digital Raster Graphics for West Virginia 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...

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1:250,000 Digital Raster Graphics for Delaware 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...

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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...

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1:250,000 Digital Raster Graphics for West Virginia 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...