Kraenzel, C. F. (1955). The great plains in transition. Norman: University of Oklahoma Press.
Παραπομπή Chicago StyleKraenzel, Carl Frederick. The Great Plains in Transition. Norman: University of Oklahoma Press, 1955.
Παραπομπή MLAKraenzel, Carl Frederick. The Great Plains in Transition. Norman: University of Oklahoma Press, 1955.
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