Data Exclude Large Wheat Producing Areas In China And Southwestern Asia, And Also Numerous Insignificant Producing Areas. Data Include Russia. Data For 1933-1938 Are Not Strictly Comparable With Earlier Figures. Source: Food Research Insitute, Wheat Studies, Volume Ix, No. 7, April 1933, P. 264; Vol. X, No. 3, December 1933, P. 120; December 1940; December 1941; November 1943.
This NBER data series a01013 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01013
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wheat Crop for WORLD [A010131WA393NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A010131WA393NNBR/, July 5, 2015.