TY  - RPRT
TI  - Quality of surface waters of the United States, 1968, Parts 4 and 5, St. Lawrence River basin and Hudson Bay and upper Mississippi River basins
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1973
DO  - 10.3133/wsp2094
UR  - https://pubs.usgs.gov/publication/wsp2094
ID  - wsp2094
ER  -