Smith, W. D. P. 1. (1906). Preliminary geological reconnaissance of the Loboo mountains of Batangas province. Bureau of Print.
Chicago-referens (17:e uppl.)Smith, Warren Du Pre 1880. Preliminary Geological Reconnaissance of the Loboo Mountains of Batangas Province. Manila: Bureau of Print, 1906.
MLA-referens (9:e uppl.)Smith, Warren Du Pre 1880. Preliminary Geological Reconnaissance of the Loboo Mountains of Batangas Province. Bureau of Print, 1906.
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