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      - HE9761-9900 Air transportation. Airlines (2)
  - HF Commerce (792)
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      - HF5387-5387.5 Business ethics (4)
      - HF5410-5417.5 Marketing. Distribution of products (324)
      - HF5428-5429.6 Retail trade (11)
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      - HF5469.7-5481 Markets. Fairs (2)
      - HF5546-5548.6 Office management (110)
        HF5548.32-.34 Electronic commerce (50)
      - HF5548.7-5548.85 Industrial psychology (41)
      - HF5549-5549.5 Personnel management. Employment management (93)
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      - HQ767.8-792.2 Children. Child development Including child rearing, child life, play, socialization, children's rights (1)
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