mentioned: "Volcanoes of the U. S, Pacific Coast"; "Descriptive Geology of the Fortieth Parallel Region"; "Geology of Leadville, Colorado"; "Structural Relations of Ore Deposits"; "Orographic Movements in the Rocky Mountains"; "Geological Distribution of the Useful Metals in the United States"; "Geology of Butte, Montana" ; "Geology of Lower California " ; "Secondary Enrichment of Ore Deposits"; "Theories of Ore Deposition Historically Considered."
His geological investigations have greatly contributed to the development of the mineral resources of America, especially his discoveries concerning the laws which govern the formation of ore deposits.
He found in nature more than in books, knowledge fitting him for his professional life. His chief recreations include mountaineering, riding, hunting, fencing, rowing, wheeling and golf.
His advice to the youth of America is to "do thoroughly and faithfully the work which comes into their hands, having faith that good work will bring its own reward, even if not in public recognition."
