Hoke C.M. Testing precious metals

Third Edition. — New York: The Jewelers Technical Advice Company, 1946. — 89 p.Qualitative and quantitative identification of precious metals: Gold, silver and platinum metals group.
The old Touchstone.
Method and the yellow golds.
Silver and some other white metals.
The quality stamp.
The platinum metal group and the white golds.
Buying and selling old precious metals.
Some paragraphs for the prospect.