TY  - RPRT
TI  - Quality of surface waters of the United States, 1967, Parts 5 and 6, Hudson Bay and Upper Mississippi River basins and Missouri River basin
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1971
DO  - 10.3133/wsp2013
UR  - https://pubs.usgs.gov/publication/wsp2013
ID  - wsp2013
ER  -