000 003120000a22001330004500
245 _aIntroduction to work study
110 _aInternational Labour Office, Geneva
250 _a3rd ed.
260 _aGeneva
_bILO
_c1979
020 _a922101939x
080 _a65.015
_bI6
041 _aEN
942 _cBK
_010
999 _c118779
_d118779