Attributes for NHDPlus version 2.1 catchments and modified routing of upstream watersheds for the conterminous United States: estimated nitrogen from septic, 2010
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This metadata record documents an ascii comma-delimited file representing estimated nitrogen in kilograms by NHDPlus v2.1 catchments for the conterminous United...
本元数据记录描述了一份ASCII逗号分隔文件,该文件包含美国本土范围内各NHDPlus v2.1集水区以千克为单位的估算氮含量……



