Each member of the party I have called by the name familiarly used on the expedition, for naturally there was no "Mistering" on a trip of this kind.

Powell was known throughout the length and breadth of the Rocky Mountain Region as "the Major," while Thompson was quite as widely known as "Prof." Some of the geographic terms, like Dirty Devil River, Unknown Mountains, etc., were those employed before permanent names were adopted.

In my other books I have used the term Amerind for American Indian, and I intend to continue its use, but in the pages of this volume, being a narrative, and the word not having been used or known to us at that time, it did not seem exactly appropriate.
Some readers may wish to provide themselves with full maps of the course of the river, and I will state that the U.S.Geological Survey has published map-sheets each 20 by 16-1/2 inches, of the whole course of the Green-Colorado.

These sheets are sent to any person desiring them who remits the price, five cents the sheet, by post-office money order addressed: "Director U.S.Geological Survey, Washington, D.C.," with the names of the sheets wanted.

The names of the seventeen sheets covering the canyoned part are: Green River( ?), Ashley, Yampa,( ?) Price River, East Tavaputs, San Rafael, La Sal, Henry Mountains, Escalante, Echo Cliffs, San Francisco Mountains, Kaibab, Mount Trumbull, Chino, Diamond Creek, St.Thomas, and Camp Mohave.
Several parties have tried the descent through the canyons since our voyage.