Silica resources of Clark County, Nevada, by Thomas D. Murphy, 1954.

The history and geology, descriptions of the formations, silica operations, markets, specifications, and reserves; references and index.

Prepared cooperatively by the USGS. Regional overview given in B63.

Bulletin 55, 43 pages, 9x6", 2 b/w drawings, 4 tables, 1 plate-- 1"=1.7 miles, geologic map, Overton area, 7x9", b/w, $2.00