Characteristics of professional workers : statistics on race, hours worked, income, weeks worked, occupation of spouse, etc
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Characteristics of professional workers : statistics on race, hours worked, income, weeks worked, occupation of spouse, etc
（U.S. census of population, 1960, v. 2 . Subject reports ; PC(2)-7E）
U.S. Dept. of Commerce, Bureau of the Census : U.S. G.P.O., 1964