00297nam a2200109Ia 450000500170000000800410001708200150005810000170007324500390009026000500012930000080017920260224040958.0260224s9999||||xx |||||||||||||| ||und||  a631.53 FEH  aFehr, W.R.   0aPrinciples of cultivar development  aNew York: Collier-Macmillan Publishers c1987  a760