| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1982 | 978-0-941620-01-7 | Thomas Penfield | Guide to Treasure in Arizona |
| 1972 | 978-0-941620-02-4 | Thomas Penfield | Guide to Treasure in Texas |
| 1975 | 978-0-941620-03-1 | E S Rocky Legaye | Gold ABC's of Panning (Prospecting and Treasure Hunting) |
| 1982 | 978-0-941620-17-8 | H. Glenn Carson | Coinshooting II Digging Deeper Coins |
| '' | 978-0-941620-23-9 | Thomas Penfield | Guide to Treasure in California |