00271nam a2200097Ia 4500008004100000082001500041100003500056245003700091260003700128300000800165140113s9999    xx            000 0 und d  a581.1   J0  a"Curtis, O.F. and Clark, D.C."  aIntroduction to plant physiology  a1950bMcGraw Hill BookcNew York  a752