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Library of Congress Subject Areas (2093)
- H Social Sciences (713)
  - H Social Sciences (General) (46)
  - HA Statistics (17)
  - HB Economic Theory (115)
    - HB238 Competition. Production (44)
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  - HC Economic History and Conditions (26)
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        HD4870 Labor bihavior (1)
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        HD4950 Employee benefits (4)
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        HD5200 Including overtime. Shift work. Sick leave. (1)
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- S Agriculture (216)
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