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Dyfyniad Arddull ChicagoTan, Kim H. Soil Sampling Preparation, and Analysis. Boca Raton: Taylor & Francis, 2005.
Dyfyniad MLATan, Kim H. Soil Sampling Preparation, and Analysis. Boca Raton: Taylor & Francis, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.