Practical business statistics / by F.E.Croxton and D.J.Cowden. Croxton, Frederick E. (Frederick Emory), 1899- Cowden, Dudley J. (Dudley Johnstone), 1899- Business Statistical methods. 311 CRP N.Y. : Prentice-Hall, 1948. 1948. 1948 Text xviii, 547 p. : eng