00258nam a2200109Ia 4500082001700000100001800017245005600035260003300091300001400124500000500138700000500143  a334bH154.PP  aHajela, T. N.  aPrinciples, problems and prectices of cooperationb  aAgrabShivlal Agarwalac1973  aiv, 569p.  a  a