12/03/2006 DESCRIPTION: ANCILLARY- Ancillary data used to develop models and select baselayers. ECO2000iii: Level III ecoregions. Used for gap analysis and modeling. EDUs: Ecologically significant drainages (coverage). (combination of ecoregion, historic drainage, modern major drainage, glacial history). EDUs used in development of species models OH14HUC: 14-digit Hydrologic Units (HUCs) of Ohio. Used in gap analysis.