Geology and earth sciences sourcebook for elementary and secondary schools.
By: Robert L. Heller, editor.  Prepared under the auspices of the American Geological Institute.
Contributors: Heller, Robert L. 1919-; National Academy of Sciences (U.S.).; University of Minnesota, Duluth Branch.
Edition: 2d ed.
Publisher: Holt, Rinehart and Winston
Published: 1970
Place of publication: New York
Language: eng
Number of pages: 459
Subjects: Geology -- Study and teaching
Notes: Held on the Duluth campus of the University of Minnesota.