Indian Petroleum Directory 1996
Chowdhary,L.R. and Tripathy,G.N.
Indian Petroleum Directory 1996 Chowdhary,L.R. and Tripathy,G.N. - Dehradun ONGC 1996
622.3318 / CHO.I
Indian Petroleum Directory 1996 Chowdhary,L.R. and Tripathy,G.N. - Dehradun ONGC 1996
622.3318 / CHO.I