00314nam a2200121 a 4500041000800000082001600008100002200024245004300046260004500089300001000134650001600144650003200160  aeng  a311bW45i57  aWilson, E. Bright  aAn introduction to scientific research  aNew YorkbMcGraw-Hill Book Companyc1952  a373 p  aESTADISTICA  aINVESTIGACIONES CIENTIFICAS