000 00261 a2200109 4500
080 _a519.4
_bP 735 P
245 1 _aProbability and frequency
_cby H.C. Plummer
260 _c1940
650 _aProbability and Frequency
100 1 _aPlummer, H.C.
_d
901 _a9636
999 _c25079
_d25079