Note 2 — Chapter I · INTRODUCTION
Reading edition
Partial discussions of the subject can be found in the First Biennial Report of the Bureau of Labor Statistics of Minnesota, pp. 131-196; First Biennial Report of the Bureau of Labor Statistics of Colorado, pp. 344-362; Fifth Annual Report of the Bureau of Labor and Industrial Statistics of Kansas, pp. 281-326; Third Biennial Report of the Bureau of Labor Statistics of the State of California, pp. 91-94; Fifth Biennial Report of the Department of Statistics, State of Indiana, pp. 173-229. The last is especially full and excellent.