Source: U.S. Department Of Agriculture, Bureau Of Statistics, Data For 1798-1898: Circular 32, "Cotton Crop Of The U.S., 1790-1911". Data For 1899-1955: Agricultural Statistics, 1942; 1950; Crop Production, Annual Summary, 1951 And 1955.
This NBER data series a01028 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01028
Release: NBER Macrohistory Database
National Bureau of Economic Research, Cotton Crop for United States [A01028USA558NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01028USA558NNBR/, October 13, 2015.