found: León, R. Balance d'azote et d'eau dans les prairies humides, 1968.
found: Holden, J.H.W. Genes, crops, and the environment, 1993:CIP t.p. (Trevor Williams)
found: Call to Cambr. U. Press, 10-1-92(John Trevor Williams; b. 6-21-38)
found: Info. converted from 678, 20120924(b. 1938)
found: Plucknett, Donald L., Gene banks and the world's food, [2014?], c1987 :t.p. (J.T. Williams)
found: The Telegraph (online), viewed 26 March 2019:obituary, dated 30 Apr 2015 (plant geneticist; John Trevor Williams (always known as Trevor) was born at Thingwall, on the Wirral peninsula, on June 21 1938; graduated Selwyn College, Cambridge, 1959; PhD in 1962, Univ. of Wales, Bangor; DSc at ETH Zurich; d. March 30, 2015)