Aerial Radiometric and Magnetic Survey: Valentine National Topographic Map, Nebraska/South Dakota
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Aerial Radiometric and Magnetic Survey: Valentine National Topographic Map, Nebraska/South Dakota, report, 1981; Grand Junction Office, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc1202291/: accessed April 12, 2021), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.