00373cam a22001217a 4500008004000000082001300040100001800053245010700071260002700178300000800205440002800213650001000241180718b1990   xxu||||| |||| 00| 0 eng d  aO62 N689  aNogues, Julio  aPatents and pharmaceutical drugs: understanding the pressures on developing countriescby Julio Nogues  aWashingtonbIBRDc1990  a41p  aWorking Papers: WPS 502  aDrugs