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Eching, S, O. (1993). Soil Science Society of America Journal Vol. 57 Nov. 5 September - October 1993 (Vol. 57 No. 5). Madison, Wisconsin, AS: Soil Science Socity of America.

Gaya MLA

Eching, S., O.. "Soil Science Society of America Journal Vol. 57 Nov. 5 September - October 1993". Vol. 57 No. 5 Madison, Wisconsin, AS: Soil Science Socity of America, 1993. Text.