Source: See Ruth P. Mack, Consumption And Business Fluctuation, A Case Study Of The Shoe, Leather, Hide Sequence, NBER, 1956.
This NBER data series m06060 appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: m06060
Release: NBER Macrohistory Database
National Bureau of Economic Research, Pairs of Shoes Sold At Retail for United States [M06060USM600SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M06060USM600SNBR/, August 2, 2015.