000 00285nam a2200109Ia 4500
008 221001s1968 xx 000 0 eng d
082 _a428.24071 ABE
245 0 _aProblems and principles in language study
260 _aLondon
_bLongmans
_c1968
300 _avii, 83p.
942 _2ddc
_cBK
999 _c50108
_d50108