00410ntaaa2200157 45000030003000000050017000030080021000200400037000410820017000781000021000952450043001162500010001592600058001693000012002276500013002390120251027202657.00714s1973 ag 01  aAR-BaBNbspacAR-BaBNeaacrdRIC a428.2400 Ec5 aEckersley, C.E.  aEssential English for foreign students a1 ed. aLondon : bLongmans, Green and Co. Ltd., c1941, 1965 a2 tomos aingleĢs