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.
Citazione stile Chigago Style (17a edizione)Spurr J. E. Josian Edward e Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.
Citatione MLA (9a ed.)Spurr J. E. Josian Edward e Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.
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