Gabelman, J.W., 1957, The origin of collapsed-plug pipes: Mines Magazine (Colorado School of Mines Alumni Association), v. 47, no. 9, p. 67-72, 79-80.
Gabelman, J.W.
Mines Magazine (Colorado School of Mines Alumni Association), v. 47, no. 9, p. 67-72, 79-80.
Mineral District, Breccia Pipe, Uranium, Mineralization,
