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Dyfyniad Arddull ChicagoGobat, Jean-Michel. The Living Soil: Fundamentals of Soil Science and Soil Biology. Enfield, NH: Science Publishers, 2004.
Dyfyniad MLAGobat, Jean-Michel. The Living Soil: Fundamentals of Soil Science and Soil Biology. Enfield, NH: Science Publishers, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.