TY  - BOOK
AU  - Spurr,Josiah Edward
TI  - Geology of the Aspen mining district, Colorado, with atlas
AV  - QE75 .M7 vol. 31
PY  - 1898///
CY  - Washington
PB  - Govt. print. off.
KW  - Geology
KW  - Colorado
KW  - Silver mines and mining
ER  -