Spurr J. E. Josian Edward & Emmons S. F. Samuel Franklin. (1898). Geology of the Aspen mining district, Colorado, wiht atlas. Washington, Governmext Printing Office, 1898.
Citación estilo ChicagoSpurr J. E. Josian Edward and Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.
Cita MLASpurr J. E. Josian Edward and Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.
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