Cover image for Testing precious metals with the touchstone.
Testing precious metals with the touchstone.
Title:
Testing precious metals with the touchstone.
Author:
Hoke, C. M. (Calm Morrison), 1887-
Publication Information:
[Place of publication not identified] : Jewelers Technical Advice Co., [1932]

[©1932]
Physical Description:
24 pages : illustrations
Language:
English
Format :
Book