00242nam a2200109Ia 4500082001900000100001800019245001500037260004800052300002200100500000500122700000500127  a530.2bR183.DY  aRamsey, A. S.  aDynamicsb  aLondonbEnglish Language Book Societyc1961  apt.1 - xii, 259p.  a  a