1980 census of population : classified index of industries and occupations. - United States. Bureau of the Census (Washington, D.C. : U.S. Dept. of Commerce, Bureau of the Census ; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1980)
"Issued October 1980."
Mode of access: Internet.
Keywords: Occupations -- Classification; Industries -- Classification; Occupations -- United States -- Classification -- Indexes; Industries -- United States -- Classification -- Indexes; United States; Indexes