Source: Federal Reserve Bulletin, April 1928, Pp. 224-225 And Successive Issues.
This NBER data series m06010 appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: m06010
Release: NBER Macrohistory Database
National Bureau of Economic Research, Sales of Chain Shoe Stores for United States [M06010USM331SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M06010USM331SNBR/, November 27, 2015.