Geological Survey investigations in the U12b.03 and U12b.04 tunnels, Nevada Test Site - Diment, W.H.; Wilmarth, V.R.; McKeown, F.; Dickey, D.D.; Hinrichs, E. N.; Botinelly, T.; Roach, C.; Byers Jr., F.M.; Hawley, C.; Izett, G. A.; Clebsch Jr., A. (Open-File Report, 1959)