000 002730000a22001210004500
245 _aProbability
100 _aBates, Grace E.
_910231
260 _aReading
_bAddison Wesley
_c1965
300 _av, 58p. : ill.
080 _a519.21
_bB3
041 _aEN
942 _cBK
_01
999 _c51393
_d51393