00910nam0-22003131i-450-990000253660403321200010100-7216-9180-3000025366FED01000025366(Aleph)000025366FED0100002536620001010d--------km-y0itay50------baitay-------001yyFundamentals of the tracer methodTeresa J. C. Welch , E. James Potchen , Michael J. Welch.PhiladelphiaW. B. Saunders company1972X, 187 p. ill. 24 cmProbabilità e statisticaWelch,Teresa Jean ConocchialiPotchen,E. James<1932- >Welch,Michael JohnITUNINARICAUNIMARCBK99000025366040332109 042-0733456DINAEDINAEUNINAING01