TY  - RPRT
TI  - Economic geology of the Georgetown quadrangle (together with the Empire district), Colorado
AU  - Josiah E. Spurr
AU  - George H. Garrey
AU  - Sydney H. Ball
PY  - 1908
DO  - 10.3133/pp63
UR  - https://pubs.usgs.gov/publication/pp63
ID  - pp63
ER  -