Source: U.S. Department Of Agriculture, "Agricultural Statistics", 1941, 1942, 1950; Crop Reporting Board, "Crop Production", 1951 Annual Summary, December 1951.
This NBER data series a01021 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01021
Release: NBER Macrohistory Database
National Bureau of Economic Research, Oat Crop for United States [A01021USA391NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01021USA391NNBR, May 31, 2016.