3 more Wyoming Geological Assoc Guidebooks. Condition is "Used". Shipped with USPS Priority Mail. 1961 Symposium on Cretaceous Rocks Wyoming and Adjacent Areas: Green River, Washakie, Wind Rive and Powder River Basins1977 Joint Wyoming Montasna Utah Geologicval Associations Guidebook: Rocky Mountain Thrust Belt Geology and Resources 1981 Energy Resources of Wyoming: Painter Reservoir, Helium, Whitney Canyon, Marianne Field, Coal Depostis, Thrust Belt, Snake River Range, Alpine to Little Greys River Anticline