The North American continent during Cambrian time / by Charles D. Walcott.

By: Material type: TextTextPublication details: Washington, Gov't. print. off., 1892.Description: 523-568 p. pl. XLII-XLV (incl. double maps) diagrs. 31 cmSubject(s): LOC classification:
  • QE656 .W2
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Cover title.

Extract from the 12th annual report of the director of the U.S. Geological survey, 1890-91, pt. I.

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