By 1869, Lewis & Clark, trappers, U.S. Army surveyors and pioneer emigrants had pretty much explored most of the continental United States, but with one notable exception: the canyons of the Green and Colorado Rivers. Sure, trappers had ventured into these canyons, most notably William Ashley on the upper Green in 1825, but he shared his tales of adventures around the campfire. To most folks at the time, the lack of published accounts enshrined these canyons as places of great myst


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