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Dyfyniad Arddull ChicagoBoyden, S. Biohistory: The Interplay Between Human Society and the Biosphere : Past and Present. Paris: Unesco and Parthenon Publishing Group, 1992.
Dyfyniad MLABoyden, S. Biohistory: The Interplay Between Human Society and the Biosphere : Past and Present. Unesco and Parthenon Publishing Group, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.