1990. Conservation and Survey Division.
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1989. Lincoln Map Future Urban Parks. LPS Natural Resource District.
1989. Lincoln Map Future Urban Parks. LPS Natural Resource District.
1989. Lincoln Map Future Urban Parks. LPS Natural Resource District.
1990. Geologic Map and Topographic Profile of the Elm Creek West Quadrangle, Nebraska. US Geological Survey.
1990. Diffendal, Jr., Robert. SCALE 1:250,000 CONTOUR INTERVAL 200 FEET Geology mapped principally from 1991-2000 by RFD, M.RV, E.JV, H. LG , and C.LT Editing and layout by R.F....
1990. Swinehart, James B. This map is necessarily generalized. For more detailed information, consult the geologic data stored in files of the Conservation and Survey Divisi... Robert F. Diffendal, Jr.
1990. Reed, E. C. (Eugene Clifton), 1901-. Conservation and Survey Division.
1990. Reed, E. C. (Eugene Clifton), 1901-. Conservation and Survey Division.
20. Groundwater Map of Nebraska Showing Relation of Fall 1961 Readings to Median Water Level Management
1990. Reed, E. C. (Eugene Clifton), 1901-. Conservation and Survey Division.