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You searched for: PLSS Remove constraint PLSS Public/Restricted Public Remove constraint Public/Restricted: Public Subject Biota Remove constraint Subject: Biota Contributor Penn State Remove constraint Contributor: Penn State Place United States of America Remove constraint Place: United States of America
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North American Breeding Bird Survey Routes penn-state

1966-present. Canadian Wildlife Service U.S. Fish and Wildlife Service U.S. Department of the Interior; now at USGS Patuxent Wildlife Research Center. The North American Breeding Bird Survey (BBS), which is coordinated by the Biological Resources Division and Canadian Wildlife Service, is a primar...

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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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Appalachian National Scenic Trail - Centerline: Pennsylvania penn-state

2001. Appalachian Trail Conference and National Park Service Appalachian Trail Park Office and National Park Service. This data set represents the most current depiction of the Appalachian National Scenic Trail centerline. Locational information used to create this...

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Ecoregions United States (Bailey) penn-state

2004. U S Department of Agriculture. This map layer is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.S. Virgi...

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Ecoregions United States (Omernik) penn-state

2003. U S Environmental Protection Agency. This map layer shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of Omernik...