Scope and Content The collection, donated to the UNM University Libraries by Henry Dethloff, consists mainly of photocopied research materials preparatory to the writing of Timeless Heritage. Spanning the period l905 to l985, the materials include USDA Forest Service newsletters, reports, memoranda, and correspondence; unpublished materials, including dissertations and theses; books, monographs, and articles; and oral histories regarding the evolution of the Forest Service in...