Appendix C: Labor Force, the Unemployed, and the Employed in Adult-Male Equivalents

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-c-labor-force-unemployed-and-employed-adult-male-equivalents.