United States Department of the Interior National Park Service, 1988. Paperback. Quarto [28 cm] Stapled green and black illustrated wraps. Very good. The covers are faded near the spine. There is a tiny stain on the top edge of the front cover. A couple of words have been circled on the first page. Item #35426
Subjects include Noncommercial River Permit System Guidelines, Helicopter Evacuation, Sanitation and Food Preparation, Suggested First Aid Items, and much more. The Appendix includes Guidelines for Conducting Research on the Colorado River Within Grand Canyon National Park.