From Brave the Wild River, chapter one

One hundred miles to the southwest as the crow flies, the Colorado River flowed into the maw of a mysterious canyon that no botanist had ever explored from head to foot. There’s no way of knowing how the thought of the Grand Canyon first entered Clover’s head. Perhaps it was merely the lure of those unknown plants, or perhaps Nevills had spoken of his dream one evening at the lodge. A guide would come in handy, Clover thought. She made a bold suggestion: they could take mules into the Grand Canyon to collect cacti for research.

A pack train wouldn’t do, declared Nevills. They would have to go by boat.

In a few minutes they laid out the entire harebrained scheme.

(Photo caption: The crew arrives at Lake Mead. From left to right, top row: Dell Reed, Norm Nevills, Emery Kolb. Bottom row: Bill Gibson, Elzada Clover, Lois Jotter, and Lorin Bell.)