Colorado

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Calaverite from Cripple Creek
W. F. Hillebrand

American Journal of Science August 1895, s3-50 (296) 128-131; DOI: https://doi.org/10.2475/ajs.s3-50.296.128
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On alunite, from Red Mountain, Ouray County, Colorado
E. B. Hurlburt

American Journal of Science August 1894, s3-48 (284) 130-131; DOI: https://doi.org/10.2475/ajs.s3-48.284.130
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Contributions to the crystallization of willemite
Samuel Lewis Penfield

American Journal of Science April 1894, s3-47 (280) 305-309; DOI: https://doi.org/10.2475/ajs.s3-47.280.305
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On the crystallization of enargite
Louis V. Pirsson

American Journal of Science March 1894, s3-47 (279) 212-215; DOI: https://doi.org/10.2475/ajs.s3-47.279.212
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Mineralogical notes
Samuel L. Penfield

American Journal of Science May 1893, s3-45 (269) 396-399; DOI: https://doi.org/10.2475/ajs.s3-45.269.396
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Contributions to mineralogy; No. 54. With crystallographic notes by S. L. Penfield
F. A. Genth

American Journal of Science November 1892, s3-44 (263) 381-389; DOI: https://doi.org/10.2475/ajs.s3-44.263.381
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Note on the constitution of ptilolite and mordenite
F. W. Clarke

American Journal of Science August 1892, s3-44 (260) 101-102; DOI: https://doi.org/10.2475/ajs.s3-44.260.101
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A new occurrence of ptilolite
[Charles] Whitman Cross and L. G. Eakins

American Journal of Science August 1892, s3-44 (260) 96-101; DOI: https://doi.org/10.2475/ajs.s3-44.260.96
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On polybasite and tennantite from the Mollie Gibson Mine in Aspen, Colorado
Samuel Lewis Penfield and S. H. Pearce

American Journal of Science July 1892, s3-44 (259) 15-18; DOI: https://doi.org/10.2475/ajs.s3-44.259.15
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Post-Laramie deposits of Colorado
[Charles] Whitman Cross

American Journal of Science July 1892, s3-44 (259) 19-42; DOI: https://doi.org/10.2475/ajs.s3-44.259.19

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