by Vaclav Smil | William E Knowland.
by A N Agarwal | S.P Singh.
by Eleanor M Hough | .
by E M Hough | H Plunkett K M Das.
by Arun Bose | .
by Ranjit San | .
by J E Meade | .
by Donald A Hay | Derek S Morris.
by Rajat K Ray | .
by J N Bhagawati | P Desai.
by D R Gadgil | .
by S S Johl | T R Kapur.
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