00318nam a2200121Ia 4500008004100000082001300041100002000054245003300074260003300107300001500140600001900155650002200174140224s9999    xx            000 0 und d  a581.5 L7  aHarper, John L.  aPopulation biology of plants  aLondonbAcademic Pressc1977  axxiv,892p.  aJohn L. Harper  aPlant populations