Gould, L. M. (1958). The Polar regions in their relation to human affairs. The American Geographical Society.
Dyfyniad Arddull ChicagoGould, Laurence M. The Polar Regions in Their Relation to Human Affairs. New York: The American Geographical Society, 1958.
Dyfyniad MLAGould, Laurence M. The Polar Regions in Their Relation to Human Affairs. The American Geographical Society, 1958.
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