Second Edition 1957
First Edition 1946
J. V. HOWELLand A. I. LEVORSEN
Second Edition, Revised and Enlarged
With the assistance of
ROBERT H. DOTTand JANE WEAVER WILDS
THE AMERICAN GEOLOGICAL INSTITUTE
operating under the
National Academy of Sciences--National Research Council
Publication No. 556
Questia, a part of Gale, Cengage Learning. www.questia.com
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: i.
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