|Sources National and Continental in Scope1|
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Publication information: Book title: Directory of Geological Material in North America. Edition: 2nd. Contributors: J. V. Howell - Author, A. I. Levorsen - Author, Robert H. Dott - Author, Jane Weaver Wilds - Author. Publisher: American Geological Institute. Place of publication: Washington, DC. Publication year: 1957. Page number: v.
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