Amaya Célis, Alfonso Arnoldo. Estimates of genetic variation and covariation of agronomic characteristics in durum wheat; Triticum durum, desf. - Fargo : North Dakota, 1964 - 73 h. : ilus North Dakota State University. Faculty of the Graduate School. Master of Science LCCN: 19206 Subjects--Topical Terms: Trigo--Variedades.