Edgertgon, Curtis D.
The mine map repository : a source of mine data / by Curtis D. Edgerton. - [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1974]. - 9 p. - Information circular ; no. 8657 . - United States. Bureau of Mines. Information circular ; no. 8657 . - Information circular (United States. Bureau of Mines) ; no. 8657 .
91055146
Mine maps.
The mine map repository : a source of mine data / by Curtis D. Edgerton. - [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1974]. - 9 p. - Information circular ; no. 8657 . - United States. Bureau of Mines. Information circular ; no. 8657 . - Information circular (United States. Bureau of Mines) ; no. 8657 .
91055146
Mine maps.