Data Cover Entire Output. For 1918, Monthly Figures Also Available: Jan. 29.1, Feb. 26.7, Mar. 33.6, Apr. 34.0, May 36.1, June 36.5, July 28.8, Aug. 28.0, Sep. 27.2, Oct. 33.2, Nov. 31.0, Dec. 31.2 Source: 1918: U.S. Department Of Agriculture Bulletin 769 Supplement, P. 4; 1919-42: Bureau Of The Census Bulletins, "Animal And Vegetable Fats And Oils;" 1942-62: "Survey Of Current Business, 1947 Supplement" And Later Monthly Issues (Facts For Industry, Series M-17-1, Fats And Oils) And Annual Issues (Animal And Vegetable Fats And Oils).
This NBER data series m02132 appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: m02132
Release: NBER Macrohistory Database
National Bureau of Economic Research, Linseed Oil Production for United States [M02132USM149NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M02132USM149NNBR/, August 29, 2015.