From the Period of the Conquest by Spain to Her Occupation by the United States of America. Containing an Account of the Discovery of the Immense Gold Mines and Placers, the Enormous Population of Gold-seekers, the Quantity of Gold Already Obtained, a Description of Her Mineral and Agricultural Resources, with Thrilling Accounts of Adventures Among the Mines. Also, Advice to Emigrants on the Best Routes, and the Preparations Necessary to Get There. To which is Added a Brief Account of the Formation of the Government and Constitution of the Said State