Hi Joey, Although Iowa is best known for its great Whitetails, super pheasant hunting and warm water fly fishing there is trout fishing in the state's Driftless Region. I happened to be "poking" around in my library and I came across a Iowa trout fishing article in a 2012 copy of "Fly Fisherman" magazine. The author's list of suggested reading is:
Iowa Trout Fishing Guide - Iowa DNR
Iowa Trout Streams - Jene Hughes
Fly Fishing Midwestern Spring Creeks, Upper Midwest Flies that Catch Trout - both by Ross Mueller
Local Contacts mentioned in the article:
Second Avenue Fly Shop
Bear Creek Anglers
Northeast Iowa Fly Fishing
I seems the book you mentioned is available via Amazon for about 25.00. It is also authored by the previously mentioned Jene Hughes. You may want to search "Driftless Trout Fishing"
Good Luck!