Symposium on Soil Productivity, Held at Varanasi and Calcutta, 1972

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National Academy of Sciences, India
National Academy of Sciences, 1973 - Crop yields - 476 pages

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The Soils of the Earth Planet and Man Activities V A Kovda
Reflexions Sur Le Concept De Productivite Des Sols S Henin
Role De La Fertilisation Dans Laccroissement De La Productivite Des Sols

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