Aperçu gratuit du livre Practical Gold-Mining: a comprehensive treatise on ... gold-bearing gravels, rocks and ores, and the methods by which the gold is extracted ... With ... plates, etc. [With a bibliography.] - Scholar's Choice Edition
Practical Gold-Mining: a comprehensive treatise on ... gold-bearing gravels, rocks and ores, and the methods by which the gold is extracted ... With ... plates, etc. [With a bibliography.] - Scholar's Choice Edition