00890cam a22002291 4500 gs 06001227 DLC 20260227111305.0 811015r1899uuuunyuabf 000 0 eng c gs 06001227 (OCoLC)7850725 Library, U.S. Geol. survey NBuU NBuU OCoLC DLC QE1 .C7 vol. 9, no. 65 Irving, J. D. (John Duer), 1874-1918. A contribution to the geology of the northern Black Hills. [New York] [s.n.] 1899. 1 p. leaf, 187-340 p. illus., plates (partly fold.) fold. map. 25 cm. Contributions from the Geological department of Columbia university. vol. IX, no. 65 Thesis (PH. D.)--Columbia university. From Annals New York academy of sciences, vol. XII, no. 9. Geology Black Hills (S.D. and Wyo.) 24525 24525