Our changing continent
By: [by John S. Schlee]
Contributors: Geological Survey (U.S.)
Publisher: U.S. Dept. of the Interior, Geological Survey
Published: 1991
Place of publication: [Washington, D.C.?
Language: eng
Number of pages: 23
Subjects: Geology -- North America; Physical geography -- North America; Continents -- Origin
Notes: Cover title

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