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	1.	A contribution to the geology of the northern Black Hills. by Irving, J. D. (John Duer), 1874-1918 Series: Contributions from the Geological department of Columbia university ; vol. IX, no. 65 Material type: Text; Format: print ; Literary form: Not fiction Publication details: [New York] [s.n.] 1899 Dissertation note: Thesis (PH. D.)--Columbia university. Availability: No items available. Add to cart (remove)
	2.	Geology and ore deposits near Lake City, Colorado, by John Duer Irving and Howland Bancroft. by Irving, J. D. (John Duer), 1874-1918 Bancroft, Howland, 1883- Cross, Whitman, 1854-1949 Series: U.S. Geological survey. Bulletin 478 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, Govt. print. off., 1911 Availability: No items available. Add to cart (remove)

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