JBWX, Russo, and others --
Copies of the book in question, Spencer Wilson's "Full Circle -- Volunteers of the C&TS", 204 pp.(2006), is available from the Friends. Just give Gwen a call at the Friends office (505-880-1311). I believe the price is $33.50.
It is a thorough history of everything Spencer could document from 1968 to the beginning of 2006 and covers much more than the volunteer aspects. It does deal with "who, what, when, where, and why", being especially thorough about the problems that occurred during the "Scenic" years. On the other hand, although Spencer does provide considerable information about the initial 1968-72 period, he does not have specific information about individual volunteers from that period except for several of the leaders and those who continued to be involved.