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- [3] EFFECT OF SOIL FACTORS ON EXTRACTION OF SOIL ORGANIC-MATTER BY ANHYDROUS FORMIC-ACID JOURNAL OF SOIL SCIENCE, 1972, 23 (02): : 119 - &
- [7] SOIL ORGANIC-MATTER DYNAMICS MICHIGAN AGRICULTURAL EXPERIMENT STATION RESEARCH REPORT, 1978, (358): : 2 - 11
- [10] NATURE OF NITROGEN-COMPOUNDS IN SOIL ORGANIC-MATTER EXTRACTED BY ANHYDROUS FORMIC-ACID JOURNAL OF SOIL SCIENCE, 1972, 23 (02): : 128 - &