00430nam a2200157 a 450000500170000008200130001710000150003024500340004526000450007930000230012463000130014796400160016099700170017699900150019395200640020820251202164319.0  a410bROG  aRoger Lass  aOn explaining language change  aLondonbCambridge University Pressc1980  a186 p.b22 cm.cHB  aLanguage  bcdefg_  a8874 LIBSS C  c7225d7225  00104070aPUbPUd2000-03-14g15.00l0o410 ROGp8874yBK