"A Social-economic grouping of the gainful workers of the United States : Gainful workers of 1930 in social-economic groups, by color, nativity, age and sex, and by industry, with comparative statistics for 1920 and 1910,... with appendix"
"A social-economic grouping of the gainful workers of the United States : gainful workers of 1930 : with comparative statistics for 1920 and 1910"@en
"A social-economic grouping of the gainful workers of the United States : gainful workers of 1930 in social-economic groups, by color nativity, age, and sex, and by industry, with comparative statistics for 1920 and 1910"
"A social-economic grouping of the gainful workers of the United States Gainful workers of 1930 in social-economic groups, by color, nativity, age, and sex, and by industry, with comparative statistics for 1920 and 1910"@en
"A social-economic grouping of the gainful workers of the United States : gainful workers of 1930 in social-economic groups, by color nativity, age, and sex, and by industry, with comparative statistics for 1920 and 1910 : with appendix"
"A social-economic grouping of the gainful workers of the United States gainful workers of 1930 in social-economic groups, by color, nativity, age, and sex, and by industry, with comparative statistics for 1920 and 1910"@en
"A social-economic grouping of the gainful workers of the United States. Gainful workers of 1930 in social-economic groups, by color, nativity, age, and sex, and by industry, with comparative statistics for 1920 and 1910"
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