Smith, G. O., & Willis, B. (1903). Contributions to the geology of Washington: Geology and physiography of central Washington. Govt. print. off..
Cita Chicago Style (17a ed.)Smith, George Otis, y Bailey Willis. Contributions to the Geology of Washington: Geology and Physiography of Central Washington. Washington: Govt. print. off., 1903.
Cita MLA (8a ed.)Smith, George Otis, y Bailey Willis. Contributions to the Geology of Washington: Geology and Physiography of Central Washington. Govt. print. off., 1903.
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