Oh well if you don't want to buy the book you could read the 20 some pages of the book on the e-bay site I posted above. I have a copy and I payed over $200 for it like four years ago. My first time out in the mountains paid for the book.
Here is a copy of The Complete, Unabridged Zip Zip by Larry Sallee offered on ebay. https://www.ebay.com/itm/THE-COMPLETE-UNABRIDGED-ZIP-ZIP-by-Larry-Sallee-Metal-Detector/273059979198 United States Ebay