Series Is Presented Here As Two Variables--(1)--Original Data, 1862-1930 (2)--Original Data, 1866-1950. Source: G.F. Warren And F.A. Pearson, The Physical Volume Of Production In The United States, Table 1, P. 5. Data For 1931: Direct From F.A. Pearson. Data For 1932: Cornell University Agricultural Experiment Station Memoir 144, 1932.
This NBER data series a01005b appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01005b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Total Crop Production for United States [A0105BUSA337NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0105BUSA337NNBR/, August 28, 2015.