George Croonenberghs of Missoula, MT was a lifelong fly tyer, pattern innovator and fly-fisherman. By profession he was a railroad engineer. His fly-fishing insight, local expertise around southwestern Montana rivers, like the Blackfoot, and unique period trout flies were instrumental in providing realism to the filming of Robert Redford’s A River Runs Through It. The following flies exude the authentic “buggy” nature of flies used by the trout hunters that imitated salmonflies and caddis in Yellowstone country in the first half of the last century.