00721nam0-22002771i-450-990002513300403321000251330FED01000251330(Aleph)000251330FED0100025133020000920d1950----km-y0itay50------baENGStatistics in SchoolW.L. Sumner.2.ed.OxfordBSSil Blackwell1950.IX, 225 p.22 cmStatistica socialeSumner,William LeslieITUNINARICAUNIMARCBK990002513300403321XXVIII-B-4272MASMASStatistics in School439753UNINAING01