I am not sure if it's still in print, but the one I have and heartily recommend is Paul Schmid's "The Experts Book - A Practical Guide to the Authentication of United States Stamps - Washington . Franklin Issues 1908 - 1923" It was published by Palm Press, and has a copyright date of 1990.
Dialysis, damned if you do...dead if you don't 01 Oct 2019 09:25:03am
re: Washington-Franklin Series Book?
The Experts Book - A Practical Guide to the Authentication of United States Stamps - Washington . Franklin Issues 1908 - 1923 is no longer in print. But I digitized it for the author (Paul Schmid) and he has it in on CD (PDF) for sale. If you need contact info let me know and I can hook you up with him.
Anyone who collects W/F will find valkue in this link, it identifies the 'source' stamps for any fake/altered W/F stamp; critical info before purchasing any of the more costly W/F stamps http://stampsmarter.com/1847usa/WFFakes.html
Don