Historical Statistics of the United
States, Colonial Times to 1970, Bicentennial
Edition, part 1 (U.S. Department of Commerce,
Bureau of the Census, 1975)
Steven Ruggles, Sarah Flood, Ronald Goeken,
Josiah Grover, Erin Meyer, Jose Pacas, and
Matthew Sobek (2018) IPUMS USA: Version 8.0
[dataset]. Minneapolis, MN: IPUMS.
tools:::Rd_expr_doi("10.18128/D010.V8.0")
Matthew Sobek (2006) Chapter Ba. "Labor Occupations"
in Susan B. Carter, ed.,
Historical Statistics of the United States,
Cambridge U. Pr.
Ian D. Wyatt and Daniel E. Hecker (2006)
"Occupational changes during the 20th century",
Monthly Labor Review, March 2006, pp. 35-57