Mining in Colorado A History of Discovery, Development and Production - Originally Published in 1926 as Professional Paper 138 This historically significant book has information on the Mining in Colorado that we haven't found in any other publication. Not only does this book give a chronological detail of mine development, it also gives a breakdown by county, by production, locations, and little tidbits on a particular mine or prospect that makes it a great research tool for historians and prospectors alike. Now back in Print by Miningbooks.com