Geology of the Tybo district, Nevada, by Henry G. Ferguson, 1933.

Descriptions of the rock formations, subdivided by age; structure including folding and faulting; geomorphology; history and production of the district; ore deposits including mineralogy, oxidation, alteration, and origin; and detailed descriptions of individual mines and prospects within the district.

Prepared in cooperation with the USGS; originally published as University of Nevada Bulletin, v. 27, no. 3, August 1, 1933; regional overviews are in B99A and B99B.

Bulletin 20, 63 pages, 9x6", 3 b/w drawings, 5 b/w photos, 3 plates: plate 1, 1"= 2000', geologic map and sections, 17x14", 2 color; plate 2, 1"=130', workings, Tybo mine, 9x18.5", b/w; plate 3, 1"=180', workings, Dimick and Gilmore Mines, 9x8", b/w, $10.80