000 00270nam a2200121Ia 4500
008 160710s1977 xx 000 0 und d
100 _aDALELA,S.
245 _aELEMENT OF WORK STUDY
250 _a2
260 _bSTANDARED PUB.
_c1977
300 _a395
942 _2ddc
_cB
999 _c52258
_d52258