PDF 172kb

"Contributions to Economic Geology - Gold & Silver"
Greaterville Chapter

by J.M.Hill, F.L.Hess, D.F. MacDonald & J.T. Pardee 1909
Bulletin No. 430-A USGS

PDF 6.2M

"Gold Placers and Placering in Arizona"

by Eldred D. Wilson, 1961

Bulletin 168, State of Arizona, Bureau of Geology and Mineral Technology. Geological Survey Branch.

PDF 1M

"Gold Placers of Arizona"

by Frank G. McClure, 1915-1916

Bulletin No. 10, Economic Series No. 5, University of Arizona Bureau of Mines

PDF 2.8M

"Notes on Some Mining Districts in Humboldt County, Nevada "

by Frederick Leslie Ransome, 1909

Bulletin No. 414 United States Geological Survey

PDF 7.51M

"Resources of Santa Cruz County"

by Allen T. Bird, 1916

Bulletin No. 29, County Resource Series No. 1, University of Arizona Bureau of Mines.