TY  - BOOK
AU  - Wells,Roger Clark
TI  - Electric activity in ore deposits
T2  - U.S. Geological survey. Bulletin 548
AV  - QE75 .B9 no. 548
PY  - 1914///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Ore deposits
N1  - Includes index
ER  -