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- mass media (5)
- desertification (2)
- history (2)
- social aspects (2)
- arctic regions (1)
- brahmaputra river valley (1)
- climatic changes (1)
- climatology (1)
- communication and technology (1)
- computational linguistics (1)
- convention on desertification (1)
- dictionaries (1)
- franklin, john, (1)
- geography (1)
- great britain (1)
- letter writing (1)
- literature and society (1)
- material culture (1)
- mathematical linguistics (1)
- monopolies (1)
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