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NAKASHIMA, T. and FUSHIMI, T.: On the forest soil after afforestation by the rehabilitation works for the bare land in the Setouchi region (I) Change of chemical property. J. Jpn. For. Soc. 51: 175-182, 1969 (in Japanese with English Summary)
OYAMA, M. and TAKEHARA, H.: Revised standard soil color chart. 1967