K2beardman - I recommend
Sudden Wealth; An Introduction to Treasure Hunting by "Deek Gladson" [Charles Dean and Gladyce Miller] (1964). Copies are between $50 and $100 when you can find them, but if you are seriously interested that is a downpayment - an investment that will be returned with your first recovery. There are hundreds of books on treasure hunting (and I own most of them) - no better book about treasure
finding than SW has been published. It was so popular there are bootleg editions out there (poorly reproduced photos, stapled binding, book number printed (not stamped) on the title page. The information is the same as in the books published by The Gold Bug, Examino Press, and later RAM, but the collector's value isn't there.
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A dandy second choice is
Characters & Cache Planters by Harley Bissell (2021). For years, copies of Harley's TS were circulated by th'ing professionals (including, of course, by KvonM himself - those are marked by his brand). George Shiotelis finally guided that work into print. It is a remarkably detailed reference. And, again, it is not inexpensive ($50). But, if you want to run with the big dogs, you have to get off the porch.
Good luck to all,
The Old Bookaroo