00288nam a2200109Ia 4500008004100000082001100041100002200052245003300074260004200107300001000149650001900159140113s9999    xx            000 0 und d  a581 L7  a"Harper, John L."  aPopulation biology of plants  b"New York : Academic Press Inc, 1977"  a892p.  aPlants biology