Ball, Sydney H.
[Other];
Garrey, George H.
[Other];
Spurr, Josiah Edward
[Other]
;
United States Congress House,
United States Geological Survey
Economic geology of the Georgetown quadrangle (together with the Empire district), Colorado, by Josiah E. Spurr and George H. Garrey, with General geology, by Sydney H. Ball. [U.S. Geological Survey Professional Paper 63.]
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Title:
Economic geology of the Georgetown quadrangle (together with the Empire district), Colorado, by Josiah E. Spurr and George H. Garrey, with General geology, by Sydney H. Ball. [U.S. Geological Survey Professional Paper 63.]