00326nam a22001097a 4500008004100000020001500041050002500056100002500081245003000106260006000136300002000196140225b        xxu||||| |||| 00| 0 eng d  a9711200112  aFil. 330 C278bc1986  aCastillo, Andress V.  aPrinciples of economics /  aManila , Philippines :bUniversity Book Supply ,cc1986  axx, 703,  p . :