TY  - RPRT
TI  - Quality of surface waters of the United States, 1956. 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  - 1960
DO  - 10.3133/wsp1451
UR  - https://pubs.usgs.gov/publication/wsp1451
ID  - wsp1451
ER  -