By James B. Beard
By W. Holmes
By Hubert Martin, Charles R. Worthing
By Roger Balls
By S.C. Pearce, G. M. Clarke, R.E. Kempson
By J Maud Kordylas
By C.L.A. Leakey, J.B. Wills
By A. Faniran, O. Areola
By Geoff Godden
By Hill, Dennis S., Waller, J. M.
By Food and Agriculture Organization of the United Nations
By Ruck, H.C.
By Agriculture, Fish.& Food, Min.of
By L.P. Smith, B.D. Trafford
By F. Baker, P. Terry
By Food and Agriculture Organization
By Ivens, G.W.
By Great Britain: Ministry of Agriculture, Fisheries and Food, P.D. Lees
By Lawrence K. Opeke
By Calvin Wyatt Rose
By J. A. Samson
By R.W. Widdowson (Bourne, Lincolnshire, UK)
By D. L. Ebbels, John Ernest King