The Figures Refer To Employment During The Last Full Calendar Week Ending At Least One Day Before The End Of The Month. Source: U.S.Department Of Agriculture, Statistical Bulletin No. 236, "Farm Employment, " September 1958 (1940-57); "Farm Labor, " February 1959; March 1963, And Monthly Issues Thereafter. U.S.Department Of Agriculture, Agricultural Marketing Service, And Statistical Reporting Service, Crop Reporting Board.
This NBER data series m08339 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08339
Release: NBER Macrohistory Database
National Bureau of Economic Research, Farm Employment, Unpaid Family Workers for United States [M08339USM175NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08339USM175NNBR/, October 8, 2015.