000 00321nam a2200121Ia 4500
008 210901s1969 xx 000 0 eng d
082 _a516.2 ELD
100 _aElderton, William Palin
245 0 _aSystems of frequency curves
260 _aLondon
_bCambridge University Press
_c1969
300 _a216p.
942 _2ddc
_cBK
999 _c13869
_d13869