Labor union membership in 1966 /
Walsh, Thomas C.
Buckholdt, Paula J.
United States.Bureau of the Census.
Washington, D.C. : U.S. Dept. of Commerce, Bureau of the Census : For sale by the Sup. of Docs., U.S. Govt. Print. Off.,
[1971]
Caption title.
"March 8, 1971."
Labor unions