00269nam a2200109Ia 4500082002400000100002500024245004300049260002700092300003000119500000500149700000500154  a519.502461bB155.MT  aBailey, Norman T. J.  aThe mathematical theory of epidemicsb  aNew YorkbHafnerc1957  aviii, 194p. Index, Tables  a  a