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The cause of color in smoky quartz and amethyst ...Holden, Edward F. January 1900 (has links)
Thesis (Ph. D.)--University of Michigan, 1925. / Cover title. Reprinted from the American mineralogist, v. 10, no. 9, Sept., 1925. "Chronological bibliography of important papers on smoky quartz and amethyst": p. 250-252.
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