American Geological Institute. (1972). Investigating the earth. Houghton Mifflin.
Tohutoru Kātū Chicago (17th ed.)American Geological Institute. Investigating the Earth. New York: Houghton Mifflin, 1972.
Tohutoro MLA (9th ed.)American Geological Institute. Investigating the Earth. Houghton Mifflin, 1972.
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