by Prem Nath | .
by K.S. Dargan | .
by Khem Singh Gill | .
by S. C. Srivatava | .
by B . K . Bakshi | .
by Hem Singh Pruthi | .
by Pushkarnath | .
by S. Pradhan | .
by K. C. Naik | .
by C. Dakhinamurti | .
by An All-India Survey | .
by B.P. Pal | .
by S . S .Sindagi | .
by M. S Swaminathan | .
by S. N. Roy | .
by S.M. Sirgar | .
by G.S. Randhawa | .
by C.G. Raghava Kurup | .
by M. S. Randhawa | .
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