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HD6951-6957 | Industrial sociology. Social conditions of labor | ||
HD6958.5-6976 | Industrial relations | ||
HD6977-7080 | Cost and standard of living | ||
HD7088-7252 | Social insurance. Social security. Pension | ||
HD7255-7256 | Vocational rehabilitation. Employment of people with disabilities | ||
HD7260-7780.8 | Industrial hygiene. Industrial welfare | ||
HD7795-8027 | Labor policy. Labor and the state | ||
HD8031 | Labor in politics. Political activity of the working class | ||
HD8038 | Professions (General). Professional employees | ||
HD8039 | By industry or trade | ||
HD8045-8943 | By region or country | ||
HD9000-9999 | Special industries and trades | ||
HD9000-9495 | Agricultural industries | ||
HD9502-9502.5 | Energy industries. Energy policy. Fuel trade | ||
HD9506-9624 | Mineral industries. Metal trade | ||
HD9650-9663 | Chemical industries | ||
HD9665-9675 | Pharmaceutical industry | ||
HD9680-9714 | Mechanical industries Including electric utilities, electronic industries, and machinery | ||
HD9715-9717.5 | Construction industry | ||
HD9720-9975 | Manufacturing industries | ||
HD9999 | Miscellaneous industries and trades |