The Non-deterioration of the Soil: Being an Essay to Explain the Continued Local Uniformity in Depth, Text and Chemical Constitution of the Soil in the Natural State, Or when Uniformly Cultivated, Whether Without Or with Manure

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Thacker, Spink, 1915 - Soil productivity - 29 pages

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The main principle sought to be established
necessitate a modification of the principle estab
is to see what insuperable difficulties result from

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