Introduction to economic statistics. By William Leonard Crum ... Alson Currie Patton ... and Arthur Rothwell Tebbutt ...William Leonard. Crum1938EN
Laboratory problems in economic statistics, by William Leonard Crum ... and Alson Currie Patton ....William Leonard. Crum1925EN
An Introduction to the Methods of Economic Statistics, by William Leonard Crum ... and Alson Currie Patton.William Leonard. Crum1925EN