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Bhattacharyya, T and Chadran, P and Ray, S K and Pal, D K and Venugopalan, M V and Mandal, C and Wani, S P (2007) Changes in levels of carbon in soils over years of two important food production zones of India. Current Science, 93 (12). pp. 1854-1863. ISSN 0011-3891