Information for this biographical note comes primarily from the Gregory Family Papers. However, some full names are taken from page 562 of Being the Portraits and Biographies of the Progressive Men of the West ...
By Notables of the West, Press Reference Library (Western edition)
Published by Internat. News Service, 1915.
Additionally, some facts were provided by the Arlington National Cemetary website: http://www.arlingtoncemetery.net.