000 00251nam a2200109Ia 4500
999 _c17506
_d17506
020 _a0023609001
100 _aRichard Johnsonbaugh
245 _aDiscrete Mathematics
260 _c1984
_bMACMILLAN PUB; CO.
_aNew York
300 _axi+436
942 _cREF