Global silver trade from the 16th to 18th centuries which China desired, so they traded silver to make up for their trade deficit. The two most important mining colonies of the Spanish Empire were Peru and Mexico, who were estimated to have provided one-hundred thousand tons of silver from the mid 16th Century to the end of the colonial period. The richest, and most productive mine in the Americas was that of Potosí in what is modern day Bolivia. The richest camp in Mexico was in the city of Zacatecas, however the production of this mine was far less than that of Potosi. More simplistic native mining techniques dominated
The Modern Home Physician use in the home. It has 728 pages that also contain, apart from the text, 232 photographs and almost 700 drawings. The Modern Home Physician The Modern Home Physician, A New Encyclopedia of Medical Knowledge is a medical encyclopedia first published in 1934 by the Wm. H. Wise & Company in New York City. It was edited by Victor Robinson, Ph. C., M.D., who was a physician and professor of the History of Medicine at Temple University's School of Medicine in Philadelphia, Pennsylvania and also the editor-in-chief of the reading materials "Historia Medicinae", "Medical Life", and "Medical Review of Reviews".