00515nam a2200193Ia 4500008004100000020001500041082001400056100001800070245001800088250000600106260004500112300000800157650004100165650003400206653001600240700002200256700002200278700002100300170901s1969    xx            000 0 und d  a071671261X  a633bJ22P  aJanick, Jules 0aPlant Science  a3  aAmericabW. H. Freeman and Companyc1969  a868  aAgriculture and related technologies  aTechnology (Applied sciences)  aField crops  aRuttan, W. Vernon  aSchery, W. Robert  aWooeds, W. Frank