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Handbook of Gem Identification by Richard T. Liddicoat. JR.

Benet’s Artefacts of England & UK 2014 Values Metal Detecting Finds 3rd Edition

How to Do Ecology : A Concise Handbook Richard, Huntzinger, Mikae

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Little Seagull Handbook With Exercises 4e: 2021 MLA Update, Richard Bullock

Gem Testing by Alan Jobbins and Basil W. Anderson (1990, Hardcover)