00389nam a22001457a 4500003000400000020001500004082001800019245003400037260004500071300001000116440004400126546001200170650004300182700001800225OSt  a0521209102  a632.7bDEL/ST  aStudies in biological control  aLondonbCambridge university pressc1976  a304p.  aInternational Biological ProgrammevV.9  aEnglish  aDefinition and planning of the product  aDelucchi, V L