Air pollution and plants : a state-of-the-art report Author(s) Subrahmanyam, G. V. Rao, D. N. Varshney, C. K. Biswas, D. K.
Ecology : study of ecosystems Author(s) Misra, K. C. Ambasht, R. S. Dwivedi, R. S. Rao, D. N. Mukherjee, K. L. Ananthakrishnan, P. V.
