Knight, R.L. The evolution of blackarm resitance in cotton / by R.L. Knight a nd J.B. Hutchinson. - London : Empire Cotton Growing Corporation, 1951. - [36-58] p. ; 20 cm. - Research memoirs. . Includes bibiographical references and index. Subjects--Topical Terms: Cotton --Diseases and pests --Sudan.---- Dewey Class. No.: 633.51062