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[2]
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[3]
Jackson ML, 1958, SOIL CHEMICAL ANALYS
[4]
MALAC BF, 1967, FOREST FERTILIZATION, P203
[5]
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[6]
PRITCHEIT W. L., 1970, Tree Growth and Forest Soil. Proceedings of the Third North American Forest Soils Conference, North Carolina State University, Raleigh, August 1968., P19
[7]
Wilde S.A., 1958, FOREST SOILS
[8]
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