This report gives the results of a reconnaissance of mining districts in Humboldt County, Nevada, made during the month of June, 1937.

This report gives the results of a reconnaissance of mining districts in Lander County, Nevada, made from March 29 to April 20 and from May 9 to May 21, 1938.

This report describes the 36 districts within Pershing County, Nev. and gives up-to-date information on active and inactive mining properties and their production.

This report gives the results of a reconnaissance of mining districts in Eureka County, Nevada, made from September 25 to October 20 and from October 27 to November 5, 1937.