EMMONS, S.F. - On hyperstene-andesite and on triclinic pyroxene in augitic rocks by Whitman Cross with a geological sketch of Buffalo Peaks Colorado.

1883. US Geological Survey Bulletin No. 1; 42 pp. 2 plts. h.t. Orig. wrps. libr. marks on cover and title page (cancelled), back cover worn, contents very good, uncut.

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