00286nam a2200109Ia 450000500170000000800410001708200140005810000160007224500380008826000420012630000080016820260224040957.0260224s9999||||xx |||||||||||||| ||und||  a581.6 NEL  aNelson, A.  0aPrinciples of agriculture bontany  aNew York: Thomas NelSon & Sons.c1946  a556