Libros como Crystal & Gem
Más de R. F. Symes
Eyewitness crystal & gem1991
Rocks & Minerals (DK Eyewitness Books)1988
Rock and Mineral1995
Rock & Mineral2008
Rocas y minerales1992
Roches et minéraux1988- Rocks & MineralsRocks & Minerals1999
Kamni i mineraly1999
Piedras preciosas y joyas1991- Rocks, Fossils and GemsRocks, Fossils and Gems1999
Taslarin Dünyasi- Crystal and GemCrystal and Gem1991