U. S. Dept. of the Interior, Bureau of Mines,
National first-aid and mine rescue contest, Louisville, Ky., October 2-4, 1957,
Information circular ;
Information circular (United States. Bureau of Mines) ;
Weaver, Harry F.
Alden, Dorothy M.
by H. F. Weaver and D. M. Alden.
National first-aid and mine rescue contest, Louisville, Ky., October 2-4, 1957,