1. Free coinage and a self-adjusting ratio: a paper read before the above, Feb'y 23, 1877 Author(s): Balch, Thomas, 1821-1877 author Publication: Philadelphia : Published by the Philadelphia Social Science Association, [1877] Subject(s): EconomicsSilverGold
2. Electro-gilding, plating, etc: extracted from Walker's Electrotype manipulation : together with the preparation of gold and purple of Cassius, from Leopold Gmelin Publication: Baltimore : J. Lucas & Son, 1860 Subject(s): Electroplating -- methodsGoldSilver
