PB book (2 staples), "Geology of the Calrk Fork Quadrangle Idaho-Montana", by Harrison and Jobin, Geological Survey Bulletin 1141-K, by U.S. Gov. Printing, 1963, 38 pages with b/w illustrations.  Also has pocket with 2 loose maps (1 is large with color, 1 is small b/w).  Book is in good shape, some light wear and fading/discoloration, binding is good, some yellowing, clean pages.  A nice book.