Montgomery, D. R. (2012). Dirt: The erosion of civilizations (New ed.). University of California Press.
Chicago-čujuhus (17. p.)Montgomery, David R. Dirt: The Erosion of Civilizations. New ed. Berkeley, Calif. ; London: University of California Press, 2012.
MLA-čujuhus (9. p.)Montgomery, David R. Dirt: The Erosion of Civilizations. New ed. University of California Press, 2012.
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