Tall Timber Pilots by Dale White, it's about one of the first pilots in the inland northwest who experimented with backcountry flying and was influential in using airplanes for delivery of US Forest Service equipment and supplies and the construction of many backcountry strips in Idaho. This can be hard to find.
I actually found it when I was ferrying my plane back from California and got forced down from scud and spent most of the day waiting in a podunk town eastern Washington and decided to walk to the library to kill some time and warm up, they had a copy in their tiny collection and I found it fascinating.
Another interesting tidbit about that day is when I saw a man sneaking around the crop duster mixing shed, then break in by busting off the padlock. I figured he was going to steal chemicals to cook meth, so I called in the cops and they came hauling in and took him down at gun point.... it definitely broke up the boredom of that day.