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"Subject": "This file contains Hydrologic Unit (HU) polygon boundaries for Illinois. The data is a seamless National representation of HU boundaries from 2 to 16 digits compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agriculture (USDA) National Resources Conservation Service (NRCS) Watershed Boundary Dataset (WBD) sources.",
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