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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.