A. H. · A Hodgkinson · Alan H.
Gemworld International · HarperCollins
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Between the Sticks | 978-0-00-810226-5 (0-00-810226-0) | 2014 |
| Visual Optics - Gem Identification Without Instruments | 978-0-9641733-1-6 (0-9641733-1-X) | 1995 |