000 002720000a22001210004500
080 _a51
_bK4
100 _aKeal, H.M.
245 _aEssential mathematics for skilled workers
260 _aNew York
_bWiley
_c1942
300 _a293p.
700 _aLeonard, C.J.
942 _cBK
999 _c53046
_d53046