Penfield, S. Lewis. (1901). Contributions to mineralogy and petrography from the laboratories of the Sheffield scientific school of Yale university. New York: C. Scribner's sons; [etc., etc.].MLA Citation
Penfield, Samuel Lewis, 1856-1906. Contributions to Mineralogy And Petrography From the Laboratories of the Sheffield Scientific School of Yale University. New York: C. Scribner's sons; [etc., etc.], 1901.
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