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 | | Visual Optics - Gem Identification Without Instruments(1st Edition) by Alan Hodgkinson Spiral, 50 Pages, Published 1995 by Gemworld International ISBN-13: 978-0-9641733-1-6, ISBN: 0-9641733-1-X |
 | | Visual Optics II The Hodgkinson Method by Alan Hodgkinson Spiral, 77 Pages, Published 1999 by Gemworld International ISBN-13: 978-0-9641733-4-7, ISBN: 0-9641733-4-4 |
