I have "Rails Sagebrush and Pine" by Mallory Hope Ferrell Just two Words "GREAT BOOK" This book was published by Golden West Books in 1967 (Hard Cover) and 128 pages. It is a great coverage on the Sumpter Valley RR.
There are several books on the EBT also.
EBT Slim Gauge Survivor by Mellander (1995)
EBT by Rainey & Kyper (1992)
Along the EBT by Heinberger (1987)
there also is a soft cover book, EBT to the mines and back by Ross Grenard and F. Kramer. I hope this helps you. Try watching on ebay.
sincereley Jim Brookes