00431nam a2200157Ia 4500008004100000020001500041082001900056100001800075245006200093250000600155260004400161300000800205650002300213650001800236653001900254170901s1978    xx            000 0 und d  a0521214939  a581.5263bH40R  aHaslam, S. M. 0aRiver PlantsbThe Macrophytic Vegetation of Water courses  a1  aLondonbCmbridge University Pressc1978  a396  aBotanical sciences  aPure Sciences  aAquatic plants