_:gZUUpUuY4. . . . . "Source: Freebase - The World's database". . . . . . . . . . "USGS National Water Information System"@en. . . . . . . . . . . . . . . "http://waterdata.usgs.gov/nwis". . "Download"@en. _:gZUUpUuY4 "usgs_national_water_information_system". _:gZUUpUuY4 . "http://waterdata.usgs.gov/nwis". . "Home page"@en.