00377nam a22001337a 4500008004100000020001500041020001500056082000800071100002100079245004000100260005300140300003100193500001900224110225t        xxu||||| |||| 00| 0 eng d  a0028235568  a0028235606  a330  aClayton, Gary E.  aEconomics: Principles and practices  aNew York:bGlencoe McGraw-Hill Companies,c1999.  axiv, 626p.bill. some col.  aincludes index