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JACKSON ML, 1947, AGR J, V39, P623
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MCDOWELL L. L., 1958, SOIL SCI SOC AMER PROC, V22, P38
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PARR JF, 1967, AGR AMMONIA NEWS, V17, P62
[10]
STANLEY FRANK A., 1956, SOIL SCI SOC AMER PROC, V20, P557