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3. Iowa State University Geographic Information Systems Support and Research Facility(1999–2020).Iowa Geographic Map server.http://ortho.gis.iastate.edu/
4. Restoration and Reciprocity: The Contributions of Traditional Ecological Knowledge
5. Prior J. C.(2017 July 11).Loess Hills.University of Iowa IIHR – Hydroscience and Engineering.www.iihr.uiowa.edu/igs/loess‐hills/?doing_wp_cron=1608496664.6557540893554687500000