Monitoring the effects of recreational use on Colorado River beaches in Grand Canyon National Park /Publisher: Flagstaff, Ariz. : Museum of Northern Arizona Press,
Date: 1986. This title can be found in 1 Iowa libraries.
Draft alternatives for the Colorado River management plan : June 1981 /Publisher: [San Francisco, Calif.] : The Service,
Date: [1981] This title can be found in 1 Iowa libraries.
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