Ex. Gov. A. P. K. Safford of Arizona; Col. J. D. Graham, of the Toltec Syndicate of mines, San Francisco; Col. R. J. Hinton, of the Evening Post, San Francisco, California; Col. Wm G. Boyle and Dr. H. R. Allen, of the Aztec Mining Company; Lieut. Geo. M. Wheeler of United States Corps of Engineers; Major J. W. Powell, of the United States Geological and Geographical Surveys; George Tyng, Editor of the Yuma Sentinel.