Appendix B: Labor Force, Employment, Unemployment, and Armed Forces, Annual and Quarterly Estimates

Clarence D. Long, The Labor Force under Changing Income and Employment (Princeton University Press, 1958), https://www.nber.org/books-and-chapters/labor-force-under-changing-income-and-employment/appendix-b-labor-force-employment-unemployment-and-armed-forces-annual-and-quarterly-estimates.