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by L.C. Ilsley, H.B. Freeman, and D.H. Zellers
Government Printing Office 1928 Technical paper 433
Available at 1 libraries
by L. C. Ilsley
United States Government Printing Off. 1925 Miners' circular 29
by L. C. Ilsley, E. J. Greim
Government Pringint Office 1920 Bulletin / United States Department of the Interior, Bureau of Mines 78
by H. H. Clark, L. C. Ilsley
Govt. print. off. 1913 Bulletin / United States Department of the Interior, Bureau of Mines 52
