000 003020000a22001330004500
245 _aOperational mathematics
100 _aChurchill, Ruel V.
250 _a2nd ed.
260 _aNew York
_bMcGraw Hill
_c1958
300 _aix, 337p. : ill.
080 _a517.56
_bC5
041 _aEN
942 _cBK
999 _c51547
_d51547