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Dyfyniad Arddull ChicagoMiller, G. Tyler. Environmental Science: Working with the Earth. 11th ed. Pacific Grove, CA: Thomson Brooks/Cole, 2004.
Dyfyniad MLAMiller, G. Tyler. Environmental Science: Working with the Earth. 11th ed. Thomson Brooks/Cole, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.