GeoMetrics, Inc. Aerial Gamma Ray and Magnetic Survey, Final Report. Volume 2: Lincoln Quadrangle (Nebraska), report, November 1977; (https://digital.library.unt.edu/ark:/67531/metadc958246/m1/64/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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