00473    a2200157   4500082001500000100003700015245007600052260003100128300002200159650002800181650003400209650002600243653001600269942001300285999001700298  a510bW151m  aWalker, Helen Mary, 1891-918942  aMathematics essential for elementary statistics: a self-teaching manual  aNew YorkbHenry Holtc1934  axiii,246p. illus.  aMathematical statistics  aStatistical mathematics95328  aTeaching guides96164  aMathematics  2ddccGEN  c58767d58756