by Kathy E. Lee ... [and others] ; prepared in cooperation with the Minnesota Pollution Control Agency, the Minnesota Department of Natural Resources, and the Legislative Commission on Minnesota Resources
Prepared [by] Department of Geology, University of Minnesota, for the meeting of Geological Society of America, Mineralogical Society of AMerica, Society of Economic Geologists [and] Paleontological Society, Minneapolis, December 28-30, 1939