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Library of Congress Subject Areas (5)
- G Geography. Anthropology. Recreation (4)
  - G Geography (General) (2)
  - GB Physical geography (1)
  - GC Oceanography (1)
  - GE Environmental Sciences (2)
- Z Bibliography. Library Science. Information Resources (1)
  - ZA Information resources (1)
    - ZA4450 Databases (1)