Age of the Rocky Mountain coal or lignitic formation

Leo Lesquereux

doi:10.2475/ajs.s3-6.36.441

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Lesquereux, L. (1873). Age of the Rocky Mountain coal or lignitic formation. American Journal of Science, s3-6(36), 441–450. https://doi.org/10.2475/ajs.s3-6.36.441

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Age of the Rocky Mountain Coal or Lignitic Formation