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Author

John I. Koivula

3 books found

Cover of Geologica

Geologica

Robert R. Coenraads, John I. Koivula · First published 2007

Cover of Photoatlas of Inclusions in Gemstones

Photoatlas of Inclusions in Gemstones

Eduard J.Gübelin, John I. Koivula · First published 2005

Cover of MicroWorld of Diamonds:A Visual Reference

MicroWorld of Diamonds:A Visual Reference

John I. Koivula · First published 2000