Series Is Presented Here As Two Variables--(1)--Original Data, 1862-1930 (2)--Original Data, 1866-1950. Source: Warren M. Persons, Forecasting Business Cycles, 1931, Pp. 170-171.
This NBER data series a01005a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01005a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Crop Production for United States [A0105AUSA322NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0105AUSA322NNBR, February 9, 2016.