Series Is Presented Here As Four Variables--(1)--Original Data, 1878-1898 (2)--Original Data, 1893-1917 (3)--Original Data, 1911-1937 (4)--Original Data, 1933-1944. Bushels Are Calculated By NBER From Original Units Of Metric Tons. Data For 1878-1898 Are For Estimates Made In Most States By The Communal Authorities. Source: Data For 1878-1885: Statistiches Handbuch, I, 1907, P. 148. Data For 1886-1898: Statistiches Jahrbuch, 1890 And Successive Issues.
This NBER data series a01011a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01011a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wheat Crop for Germany [A0111ADEA393NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0111ADEA393NNBR/, October 4, 2015.