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Regional economic impacts of Grand Canyon river runners.
Hjerpe EE, Kim YS. Hjerpe EE, et al. Among authors: kim ys. J Environ Manage. 2007 Oct;85(1):137-49. doi: 10.1016/j.jenvman.2006.08.012. Epub 2006 Oct 27. J Environ Manage. 2007. PMID: 17070647
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