Page 216 - اشغال المعادن الفرقة الاولى

3- Kraus and Slaws on: Gems and Gem Materials,

5th ed. McGraw Hill Book Co., N.Y., 1951

4- Pioneer Technical Services, (1994) Abandoned

Hard Rock Mine Priority Sites, Abandoned and

Inactive Mines Scoring System (AIMSS), Report to

Montana department of State Lands,

215