Series Is Presented Here As Two Variables--(1)--Original Data, 1917-1941 (2)--Original Data, 1940-1955 No Monthly Data Were Collected For 1919. Data Beginning With 1929 Covers Zinc Produced From Domestic Ores Only. The Differences Are Negligible And Series Can Be Used As Continous. Source: Record Book Of Business Statistics, Part Ii, P. 52; Survey Of Current Business, Supplement 1927-1928; 1932 Supplement, P. 228; 1936 Supplement, P. 125; And Successive Supplements Through The 1955 Edition, Monthly Issues Thereafter.
This NBER data series m01140aa appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01140aa
Release: NBER Macrohistory Database
National Bureau of Economic Research, Slab Zinc Production for United States [M010AAUSM601NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M010AAUSM601NNBR/, September 1, 2015.