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By Hubert Martin, Charles R. Worthing
By Whatley, Jean M.
By Mackenzie, David, Laing, Jean
By Adel A Kader
By John E. Preece, Paul Read
By Henry Hobhouse
By J Maud Kordylas
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By Agriculture, Fish.& Food, Min.of
By A. Faniran, O. Areola
By James Mandaville
By Food and Agriculture Organization of the United Nations
By H. Smith
By Food and Agriculture Organization
By John H. Dodds, Lorin W. Roberts
By L.P. Smith, B.D. Trafford
By F. Baker, P. Terry
By British Crop Protection Council
By Ivens, G.W.
By Great Britain: Ministry of Agriculture, Fisheries and Food, P.D. Lees
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