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MARTIN W. E., 1965, SOIL SCI SOC AMER PROC, V29, P411
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PAPENDICK R. I., 1965, SOIL SCI, V100, P182, DOI 10.1097/00010694-196509000-00006
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STEWART B. A., 1965, SOIL SCI SOC AMER PROC, V29, P752
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