00298nam a2200121Ia 4500008004100000040001600041041001200057082001700069100002000086245003300106260002600139300001100165230917s9999||||xx |||||||||||||| ||und||  e14836aMAIN  aEnglish  a301.44 R393C  aRichardson, C J 0aContemporary social mobility  aLondonbNichalsc1977  a342 p.