_:genid1 . _:genid1 "" . _:genid2 . _:genid2 . _:genid3 . _:genid3 . "doi-95" . "National Water Quality Assessment (NAWQA) Program"^^ . _:genid1 . . "National scope of NAWQA water-quality sample- and laboratory-result data and other supporting information obtained from NWIS systems hosted by individual Water Science Centers as well as national BioTDB system for aquatic biological data on communities and habitats and stored in a centralized NAWQA Data Warehouse (DWH)"^^ . _:genid2 . _:genid3 . . _:genid4 . _:genid4 . _:genid4 . _:genid4 . "DOI-95" . . "national-water-quality-assessment-nawqa-program" . .