Sawatch Range

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Some observations on the beryllium minerals from Mount Antero
Samuel L. Penfield

American Journal of Science December 1890, s3-40 (240) 488-490; DOI: https://doi.org/10.2475/ajs.s3-40.240.488
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Crystallized bertrandite from Stoneham, Maine, and Mount Antero, Colorado
Samuel L. Penfield

American Journal of Science March 1889, s3-37 (219) 213-216; DOI: https://doi.org/10.2475/ajs.s3-37.219.213
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Bertrandite from Mount Antero, Colorado
Samuel Lewis Penfield

American Journal of Science July 1888, s3-36 (211) 52-55; DOI: https://doi.org/10.2475/ajs.s3-36.211.52
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Phenacite from Colorado
Samuel L. Penfield

American Journal of Science February 1887, s3-33 (194) 130-135; DOI: https://doi.org/10.2475/ajs.s3-33.194.130
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Notes on the age of the Rocky Mountains in Colorado
A. C. Peale

American Journal of Science March 1877, s3-13 (75) 172-181; DOI: https://doi.org/10.2475/ajs.s3-13.75.172

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