Prices Are Those Charged By The Manufacturer To The Wholesale Jobber. For 1890-1898, Data Are First Of Quarter Quotations. For 1899-1917, First Of Month Quotations Are Given. 1918-1931 Data Are Daily Averages Of Quotations, And 1932-1939 Data Are The Average Of The Quotations As Of One Day Each Week. Source: Bls Bulletins And "Wholesale Prices."
This NBER data series m04153 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04153
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price of Copper Sheet, Hot Rolled, Base Sizes for New York [M04153US000NYM267NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04153US000NYM267NNBR/, August 2, 2015.