Senate Committee on Finance, Wholesale Prices, Wages, and Transportation, Senate Report No. 1394, “The Aldrich Report,” Part I, 52nd Congress, 2d sess., March 3, 1893; and U.S. Department of Labor, Course of Wholesale Prices, 1890–1901, Bulletin No. 39, March 1902, pp. 205–09. (found online
at:http://www.bls.gov/ppi/ppicpippi.htm)