Dear Peter, The account by James Pond (Twain's lecture agent at the time) of this event, is printed in the wonderful book titled, "Overland With Mark Twain: James B. Pond's Photographs and Journal of the North American Lecture Tour of 1895". ISBN1-880817-00-4. This book also reproduces two different photographs taken behind Twain's back while viewing Fort Missoula on August 6th, and explains how Mark Twain was actually arrested as a practical joke. Twainiacally Yours, Bob Slotta