00286nam a2200109Ia 450000500170000000800410001708200140005810000180007224500410009026000370013130000080016820260225051033.0260224s9999||||xx |||||||||||||| ||und||  a581.5 WAL  aH.R. Wallace  0aNematode ecology and plant diseases   aLondon: Edward and Arnold c1973  a228