(1973). Focuson environmental geology: A collection of case histories and readings from original sources. New York: Oxford University Press.
Styl ChicagoFocuson Environmental Geology: A Collection of Case Histories and Readings From Original Sources. New York: Oxford University Press, 1973.
Citace podle MLAFocuson Environmental Geology: A Collection of Case Histories and Readings From Original Sources. New York: Oxford University Press, 1973.
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