Copper and nickel resources in the Duluth complex, northeastern Minnesota /
by Bill Bonnichsen.
APA Citation
Bonnichsen, B., Minnesota Geological Survey. (1974). Copper and nickel resources in the Duluth complex, northeastern Minnesota. St. Paul: Minnesota Geological Survey.
MLA Citation
Bonnichsen, Bill, and Minnesota Geological Survey. Copper And Nickel Resources In the Duluth Complex, Northeastern Minnesota. St. Paul: Minnesota Geological Survey, 1974.
Warning: These citations may not always be complete (especially for serials).