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Location of 2008–2009 sample sites within three large ecoregions used by NRSA – the East, Plains and West. The 9 finer-scale ecoregions across all three regions are Northern Appalachians (NAP), Southern Appalachians (SAP), Coastal Plains (CPL), Upper Midwest (UMW), Temperate Plains (TPL), Northern Plains (NPL), Southern Plains (SPL), Western Mountains (WMT) and Xeric (XER).
