Geothermal Resources of Nebraska (RM-7): Gosnold, W. D., Jr., Eversoll, D. A. (1:500,000; 1982), size 60" x 36". Description: This geothermal resources map is a synthesis of data on bottom-hole temperatures, temperature gradients, heat flow, thermal conductivity, and stratigraphy. Most of these data were collected specifically for assessing Nebraska's geothermal resources; color. Print on demand from color master.