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- Library of Congress Subject Areas (1)
- H Social Sciences (1)
- HD Industries. Land use. Labour (1)
- HD9000 Special industries and trades (1)
- HD9680 Mechanical industries Including electric utilities, electronic industries, and machinery (1)
- HD9709 Transportation equipment. Vehicules (1)
- HD9680 Mechanical industries Including electric utilities, electronic industries, and machinery (1)
- HD9000 Special industries and trades (1)
- HD Industries. Land use. Labour (1)
- H Social Sciences (1)
Number of items at this level: 0.