Release: NBER Macrohistory Database
Data For 1904-1905 Include An Unknown Quantity Smelted From Foreign Ore, Small In 1904 But Larger In 1905. Beginning 1906, Data Include Production From Both Domestic And Foreign Ore. In 1906, The Percentage Of Zinc Smelted From Foreign Ores Was 11.2; In 1939, 3.2. Data For 1932 Include Domestic Ores Only. Data Was Also Checked With Metal Statistics. Source: Mineral Resources And Minerals Yearbook.
This NBER data series a01176 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01176
National Bureau of Economic Research, Slab Zinc Production for United States [A01176USA601NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A01176USA601NNBR, August 30, 2016.