<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>J.M. Omernick</dc:creator>
  <dc:date>1987</dc:date>
  <dc:description>Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987).  This is a copy of the ecoregion coverage of Omernik (1987) with some item names modified. This is NOT the most recent version of the ecoregion definitions, which can be obtained from: Environmental Protection Agency, Western Ecology Division, Corvallis, OR at http://www.epa.gov/wed/pages/ecoregions/level_iii.htm.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/70046266</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Aquatic ecoregions of the conterminous United States</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>