Gemstones
- 176 stránek
- 7 hodin čtení
Describes the history of the mining and uses of precious stones and discusses scientific research into the formation and properties of gems.
Paul O´Neil Knihy
Die Flußdampfer
- 240 stránek
- 9 hodin čtení
Describes the history of the mining and uses of precious stones and discusses scientific research into the formation and properties of gems.