1. 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 Author/Creator: United States. Bureau of the Census Publication/Creation: Washington : U.S. Govt. Print. Off, 1938 Resource Type: Book Access & Availability: Loading