00286nam a2200097Ia 4500008004100000082001300041100003400054245005500088260003700143300000800180140113s9999    xx            000 0 und d  a633   J9  a"Wolfe, T.K. and Kipps, M.S."  aProduction of field crops : A textbook of Agronomy  a1959bMcGraw Hill BookcNew York  a653