Just about any book is better than Clymer!(Is there a better book than Clymer?)
The first place to start is with factory H-D service manual, riders handbook, and parts book. All are available from your dealer, in reprint aftermarket, or on eBay. The factory '59-'69 manual covers most all mechanical issues. Either a '61 or '68 parts book will help immensely. The '65 book is not reprinted and there is no book specifically for '62. The riders handbook was reprinted by H-D and you may be able to still locate one from a dealer if not from eBay. H-D also has some compilations of multiple books in one which are also available from dealers. Check them out!
And don't neglect to search the knowledge base on this site.
Palmer's book is a must have!
Robbie