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Piedmont (ecoregion)
Ecoregions of New England Forested Land Cover, Nutrient-Poor Frigid and Cryic Soils (Mostly Spodosols), and Numerous High-Gradient Streams and Glacial Lakes
East and Central Farming and Forest Region and Atlantic Basin Diversified Farming Region: 12 Lrrs N and S
Characterization of Ecoregions of Idaho
Level III Ecoregions of the Continental United States 3
Ouachita Mountains Ecoregional Assessment December 2003
Ecoregion IX EPA -822-B-00-019
Level IV Ecoregions of Montana
Ecoregions of Western Washington and Oregon the Coastal Lowlands (1A) Are Noted for Their Douglas-Fir Blanketed Inland Areas
Ecoregions of Tennessee
18. Geologic Terms and Geographic Divisions
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Ecoregions of Alabama and Georgia Lower and Has Less Relief and Contains Different Rocks and Soils Than 45D
The Paleozoic and Mesozoic Rocks; a Discussion to Accompany the Geologic Map of the United States
Physiographic Regions
Geoarchaeology and the Cross Timbers
Ozark-Ouachita Highlands Assessment
Ecoregion IX EPA-822-B-00-011
Report and the CD Constitute the Latest Products of This Planning Effort
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Ecoregions of Colorado 21
Level III Ecoregions of the Continental United States 1
Description of the Sections and Subsections of the Interior Highlands of Arkansas and Oklahoma Thomas L
Level IV Ecoregions of Oregon
North American Terrestrial Ecoregions—Level III April 2011