Engeln, O. D. v. (1942). Geomorphology: Systematic and regional. McMillan.
Tohutoru Kātū Chicago (17th ed.)Engeln, O. D. von. Geomorphology: Systematic and Regional. Nueva York: McMillan, 1942.
Tohutoro MLA (9th ed.)Engeln, O. D. von. Geomorphology: Systematic and Regional. McMillan, 1942.
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