1. Some limitations on the possible composition of the ore-forming fluid;Barton;Econ. Geology,1957
2. Barton, P. B.Jr.Toulmin, Priestley, 3d, 1961, Some mechanisms for cooling hydrothermal fluids, in Short Papers in the Geologic and Hydrologic Sciences, 1961: U. S. Geol. Survey Prof. Paper 424-D, p. 348–352.
3. Bastin, E. S.Hill, J. M., 1917, Economic geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties, Colorado: U. S. Geol. Survey Prof. Paper 94, 379 p.
4. Problems of wall-rock alteration in shallow volcanic environments;Burbank;Colorado School Mines Quart.,1950