Profile Map of Engineer Mountain, Mineral Point Mountain, Animas Forks, and Surrounding Region: With General Description of Mines, History and Geology of San Juan

Geology of Colorado Ore Deposits

Geology of Colorado and Western Ore Deposits

Geology of Colorado and Western Ore Deposits

Prospecting for Gold and Silver

Geology of Western Ore Deposits

Prospecting for Gold and Silver in North America

Prospecting for Gold and Silver in North America

Geology of Colorado Ore Deposits

Prospecting for Gold and Silver in North America

Geology of Western Ore Deposits

Geology of Western Ore Deposits