TY  - BOOK
AU  - Irving,J.D.
TI  - A contribution to the geology of the northern Black Hills
T2  - Contributions from the Geological department of Columbia university
AV  - QE1 .C7 vol. 9, no. 65
PY  - 1899///
CY  - [New York]
PB  - [s.n.]
KW  - Geology
KW  - Black Hills (S.D. and Wyo.)
N1  - From Annals New York academy of sciences, vol. XII, no. 9; Thesis (PH. D.)--Columbia university
ER  -