Data For 1884-1905 Were Published In Original Source As Imperial Bushels; Data For 1906-1938 Were Published As Quarters And Converted To Imperial Bushels By Dividing By Eight. Data Exclude Ireland. Source: Ministry Of Agriculture And Fisheries, Agricultural Statistics.
This NBER data series a01020 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01020
Release: NBER Macrohistory Database
National Bureau of Economic Research, Barley Crop for Great Britain [A01020GBA394NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01020GBA394NNBR/, November 27, 2015.