Burchett, R. R., Carlson, M. P., 1966. Twelve Maps Summarizing the Geologic Framework of Southeastern Nebraska (GSI-1): 14 pp., size 8.5" x 11". Description: This publication is a series of twelve small scale maps for a 13-county area chosen because of its importance in understanding the Paleozoic history of Nebraska. These counties contain the only outcropping rocks of Permian and Pennsylvanian age and also the most complete stratigraphic record of pre-Pennsylvanian deposits in the state. This information was obtained from studies of outcrops, oil tests, water wells, and stratigraphic tests. Out of print, unbound copy available for purchase.