Bhattacharyya, T and Chandran, P and Ray, S K and Mandal, C and Pal, D K and Venugopalan, M V and Durge, S L and Srivastava, P and Dubey, P N and Kamble, G K and Sharma, R P and Wani, S P and Rego, T J and Pathak, P and Ramesh, V and Manna, M C and Sahrawat, K L (2008) Physical and Chemical Properties of Red and Black Soils of Selected Benchmark Spots for Carbon Sequestration Studies in Semi-Arid Tropics of India : Global Theme on Agroecosystems Report no. 35. Monograph. International Crops Research Institute for the Semi-Arid Tropics , Patancheru, Andhra Pradesh, India.