Source: U.S. Department Of Commerce, Data For 1919-1922: Record Book Of Business Statistics, Part 2, P. ;39; Data For 1923-1931: Survey Of Current Business, 1932 Supplement, Pp. 206-207
This NBER data series m05030 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: m05030
Release: NBER Macrohistory Database
National Bureau of Economic Research, Miscellaneous Enamel Sanitary Ware Stocks for United States [M05030USM588NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M05030USM588NNBR/, October 8, 2015.