Crosswalk table between 12-digit hydrologic unit code (HUC12) and hydrologic region boundaries

This data release contains a crosswalk between subwatersheds (12-digit hydrologic unit codes; hereafter, HUC12s) and hydrologic regions (sometimes called "Van Metre...本数据集发布内容包含子流域（subwatersheds，12位水文单元代码，后文简称HUC12）与水文区域（hydrologic regions，有时也称为‘范米特（Van Metre）……’）之间的匹配对照表。