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Level III Ecoregions of Pennslyvania
Revised March 1999
National Health and Environmental Effects Research Laboratory
U.S. Environmental Protection Agency
58. Northeastern Highlands
60. Northern Appalachian Plateau and Uplands
61. Erie Drift Plains
62. North Central Appalachians
67. Ridge and Valley
69. Central Appalachians
70. Western Allegheny Plateau
83. Eastern Great Lakes and Hudson Lowlands