books.google.com - The years 1880 to 1930 mark the period in Texas' coal mining history known as the hand loading era, during which the system of mining for coal by hand was established and gave way to new methods used on both sides of the Texas-Mexico border. The contributions of the large immigrant population who worked...http://books.google.com/books/about/Mexican_coal_mining_labor_in_Texas_and_C.html?id=ATAHwcN2hhgC&utm_source=gb-gplus-shareMexican coal mining labor in Texas and Coahuila, 1880-1930
