Source: Federal Reserve Board, Federal Reserve Bulletin, Successive Issues.
This NBER data series m01125 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01125
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Crude Petroleum Production for United States [M01125USM343SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M01125USM343SNBR/, August 3, 2015.