vol. 50 no. 2 153-165
- Received June 19, 2015.
- Revision received September 23, 2015.
- Accepted September 30, 2015.
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© 2015 University of Wyoming Gold Open Access: This paper is published under the terms of the CC-BY license.
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- 1Department of Geography and Geology, 6001 Dodge Street, University of Nebraska Omaha, Omaha, Nebraska 68182-0199, U.S.A.
- 2Terracon, 15080 A Circle, Omaha, Nebraska 68144, U.S.A.
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