It appears the only place to get Harley's latest book is through the Federation of Flyfishers and is titled as follows:
His recently published book, offered as compact disk by the Federation of Fly Fishers Hunt?Don?t Pray?for Fish: Techniques and Strategies for Fly Fishing from a Drift Boat is a culmination of almost 60 years of guiding and fly-fishing experience gained from fishing all over the United States and parts of Canada and Mexico.
If you're interested here is the FFF link: http://www.fedflyfishers.org/
"There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home."
Roderick Haig-Brown, "Fisherman's Spring"