by Robert Mabro | .
by John M Kerr | .
by Vaclav Smil | William E Knowland.
by A V Baez | .
by Tirath Gupta | Amar Guleria.
by A N Agarwal | S.P Singh.
by J D Parker | .
by S Krishaswamy | .
by International Commission On Irrigation And Drainage On Application Of Systems Analysis To Irrigation,Drainage And Flood Control | .
by S Giriappa | .
by S E Jorgensen | .
by | .
by B S Baviskar | .
by Ashim Kumar Roy | N N Gidwani.
by Eleanor M Hough | .
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