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- Library of Congress Subject Areas (2)
- H Social Sciences (2)
- HD Industries. Land use. Labour (2)
- HD9000 Special industries and trades (2)
- HD9680 Mechanical industries Including electric utilities, electronic industries, and machinery (2)
- HD9709 Transportation equipment. Vehicules (2)
- HD9680 Mechanical industries Including electric utilities, electronic industries, and machinery (2)
- HD9000 Special industries and trades (2)
- HD Industries. Land use. Labour (2)
- H Social Sciences (2)
Number of items at this level: 0.