00283nam a2200109 a 450000500170000008200180001710000200003524500330005526000330008830000290012163000230015020251203091012.0  a581.5248bHAR  aHarper, John L.  aPopulation biology of plants  aLondonbAcademic Pressc1979  axxvi, 892 p.b22 cm.cHB  aPopulation biology