Sample survey methods and theory : Vol . 1 : Methods and applications / Morris H. Hansen, William N. Hurwitz and William G. Madow. Hansen, Morris H. Hurwitz, William N. jt. aut. Madow, William G. jt. aut. Sampling (Statistics) QA276 .H33 311 HAS Includes index. New York : Wiley, 1953. 1953. 1953 Text v. : eng A Wiley publications in statistics