Lake Superior iron resources :
preliminary samples and metallurgical evaluation of selected Michigan-Wisconsin iron formations /
by L.F. Heising and D.W. Frommer.

APA Citation

Heising, L. F., Frommer, D. W., United States. Bureau of Mines. (1967). Lake Superior iron resources: preliminary samples and metallurgical evaluation of selected Michigan-Wisconsin iron formations. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Heising, Leonard F, Donald W Frommer, and United States. Bureau of Mines. Lake Superior Iron Resources: Preliminary Samples And Metallurgical Evaluation of Selected Michigan-Wisconsin Iron Formations. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1967.