I have the Al Blyth book from 1991. It's a great book but it's pretty old. I hope to find a website to help me spot anything special in my collection. With Seated Dimes I found Gerry Fortin's site. If there is something better, please let me know.
You have to go to the Liberty Seated Collectors Club site. I wish I could tell you how to find it on the new web page, but there is a link at the top to the old web page. Click on that and go to online resources. There are 2 half Dime references at the top of the list. The Steve Crain identification site is the older link. Clint Cummins posted his brand new Half dime site just recently. Everything is free. James
There is the old Valentine publication. Then there is Kevin Flynn's book "The Authoritative Reference on Liberty Seated Half Dimes", 2014. Then there is Clint Cummins work-in-progress which, for the issues he has completed, is the most recent and thorough. Found either at the LSCC site or at: https://sites.google.com/view/clintcummins/half-dime-attribution-guide