Image: Water Resource Regions of the United States of America
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Water_Resource_Regions_of_the_United_States_of_America.jpg (636 × 438 pixels, file size: 209 KB, MIME type: image/jpeg)
Description: Map of the 21 water resource regions, with unique 2-digits hydrologic unit codes (HUCs), of the United States of America, per the USGS hydrologic unit classifications of region as the first level of classification.
Title: Water Resource Regions of the United States of America
Credit: http://water.usgs.gov/wsc/imageregions.jpg
Author: USGS
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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