The North American continent during Cambrian time
By: by Charles D. Walcott.
Publisher: Gov't. print. off.
Published: 1892
Place of publication: Washington
Language: eng
Number of pages: 568
Subjects: Geology, Stratigraphic -- Cambrian.; Geology -- North America.
Notes: Cover title.
Extract from the 12th annual report of the director of the U.S. Geological survey, 1890-91, pt. I.