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Soil microbiology and biochemistry

By Paul, E.A.. San Diego, CA (USA) : Academic Press, 1988 . x, 273 pages , Illustrations, tables, graphs, references, glossary p. 259-264, index p. 265-273 0-12-546805-9

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Methods of soil analysis

Madison, WI (USA) : ASA, 1965 . xlii, 770 pages , Contents: Part 1: Physical and mineralogical properties including statistics of measurement and sampling

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Soil nitrogen

Madison, WI (USA) : ASA, 1965 . xvi, 615 pages , Illustrations, tables, graphs, references, index p. 607-615

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