TY  - BOOK
AU  - Knopf,Adolph
TI  - Ore deposits of the Helena mining region, Montana
T2  - U.S. Geological survey. Bulletin 527
AV  - TN24.M9 K5
PY  - 1913///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Mines and mineral resources
KW  - Montana
KW  - Geology
N1  - Some of the plates printed on both sides of leaf; "Literature": p. 18-19; Includes index
ER  -