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.
1969. G.W. & C.B. Colton & Co. Entered according to act of Congress in the year 1865 by G.W. & C.B. Colton ...; Prime meridians: Greenwich and Washington.; Includes inset of "Pla... G.W. & C.B. Colton (New York), 1865.
Big Ten Academic Alliance Geospatial Information Network.
2008. LPS Natural Resource District. 1 page aerial map showing the saline wetlands north of Lincoln.
1990. Conservation and Survey Division.