1. O. Abou-El-Shawareb, 1971 : Comparative efficiency of mass and recurrent selection breeding methods in the improvement of Egyptian "Berseem" (Trifolium alexandrinumL.) . Ph. D. Thesis , Faculty of Agric. Cairo Univ.
2. Genotypic and Environmental Variances and Covariances in an Upland Cotton Cross of Interspecific Origin
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3. F. M. Ali, 1971 : The effect of mass selection on forage yield and related traits in berseem clover (Trifolium alexandrinumL.) . M. Sc. Thesis , Cairo, Univ., Giza, Egypt.