1989. LPS Natural Resource District. 3 pages of aerial maps showing the Salt Creek and Little Salt Creek areas north of Lincoln.
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1990. Elder, John A. Conservation and Survey Division.
1989. LPS Natural Resource District.
1989. A diagram of geology of the state of Nebraska. LPS Natural Resource District.
1989. LPS Natural Resource District. 1 page aerial map showing Blue Heron Marsh Wetland area.
1990. Conservation and Survey Division.
2008. LPS Natural Resource District. 1 page aerial map showing the saline wetlands north of Lincoln.
1887. Glass Lantern Slide, 3 1/4 X 4 in. UNL Libraries Image & Multimedia Collections.
1990. Conservation and Survey Division.
1990. Conservation and Survey Division.