C.L. Forn J.R. Hassemer J. D. Hoffman E. L. Mosier J. M. Nishi R. M. O’Leary D. F. Siems R. L. Turner E. P. Welsch George Van Trump Maurice A. Chaffee 1978 application/pdf 10.3133/ofr78790 en U.S. Geological Survey, Geochemical analyses of rock and soil samples, Eureka Mining District and vicinity, Eureka and White Pine Counties, Nevada reports