000 00224nam a2200085 4500
080 _a517
_bCHU.58
245 _aOperational Mathematics. Ed. - 2
100 _aChurchill, Ruel V
260 _aNew York
_bMcGraw-Hill Book Company, Inc.
_c1958
300 _aix+337p
999 _c23761
_d23761