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Merrill, George P (1906). Contributions to the History of American Geology. Washington: Gov’t Printing Office, pp 189 to 734 + 37 plates. Hardback,. Smithsonian.
Agassiz, Louis (1869). Geological Sketches. Boston: Fields, Osgood & Co. 1st edition, 311pp. Hardback,. Fields Osgood.
Maclure, William (1817). Observations on the Geology of the United States of America; A 1962 REPRODUCTION. Werner Fritsch.
Hess, H.H. (1960). Stillwater Igneous Complex, Montana; a Quantitative Mineralogical Study. Geological Society of America Memoir 80,. Geological Society of America.
Taylor, R.B. (1964). Geology of the Duluth Gabbro Complex near Duluth, Minnesota. Minneapolis, Minnesota, 1st edition. Minnesota University Presss.