FAI seminar 1979 on critical areas affecting fertilizer consumption in India : Proceedings of the seminar at New delhi from December 13 to 15, 1979 - Roy, R.N., ed.; Alexander, T.M., ed.; Biswas, B.C., ed.; Chandra, Subhash, ed.; Singh, Ramendra, ed.; Suri, K.L., ed. (Fertilizer Association of India New Delhi, 1980)