Khalaf, Abdul-Ghafour M., 1945-. Variation among 2-, 3-, and 4- way soybean crosses [microform] / by Abdul Ghafour M. Khalaf. - Ann Arbor, Mich. : University Microfilms International, 1979. - 1 microfilm reel : positive ; 35 mm. Thesis (Ph.D.) - Purdue University, 1979. Subjects--Topical Terms: Soybean.