21. Geologic maps of upper Cenozoic deposits in central California Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, VA : U.S. Geological Survey ; Denver, CO : For sale by U.S. Geological Survey, Map Distribution, 1993 Resource Type: Map Access & Availability: Loading
22. Map showing distribution, composition, and age of early and middle Cenozoic volcanic centers in Colorado and Utah Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
23. Map showing distribution, composition, and age of early and middle Cenozoic volcanic centers in Idaho, Montana, west-central South Dakota, and Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
24. Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains. Northern Great Lake States and central Mississippi Valley states, the Great Lakes, and southern Ontario (80⁰31ʹ to 93⁰ west longitude) Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : Information Services [distributor]. Resource Type: Map Access & Availability: Loading
25. Maps showing distribution, composition, and age of early and middle Cenozoic volcanic centers in Arizona, New Mexico, and west Texas Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
26. Maps showing modern fissures and Quaternary faults in the Dry Lake Valley area, Lincoln County, Nevada Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
27. Neogene geomorphic evolution of the central San Juan Mountains near Creede, Colorado Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
28. Precambrian basement map of the Trans-Hudson orogen and adjacent terranes, northern Great Plains, U.S.A Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by U.S. Geological Survey Map Distribution Resource Type: Map Access & Availability: Loading
29. Quaternary geologic map of the Austin 4° x 6° quadrangle, United States Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, VA : The Survey ; Denver, CO : For sale by Map Distribution, 1993 Resource Type: Map Access & Availability: Loading
30. Quaternary geologic map of the Blue Ridge 4° x 6° quadrangle, United States Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : U.S. Geological Survey ; Denver, CO : For sale by Map Distribution, 1991 Resource Type: Map Access & Availability: Loading