00281nam a2200109Ia 450000500170000000800410001708200160005810000170007424500340009126000380012530000080016320260225051023.0260224s9999||||xx |||||||||||||| ||und||  a631.522 ALL  aR.W. Allard  0aPrinciples of plant breeding   aNew York: John Wily & Sons c1960  a485