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Subject
- World War, 1939-19459
- Geology, Structural5
- Indigenous peoples of North America3
- Economic development2
- Economic indicators2
- Environmental indicators2
- Geography2
- Gross national product2
- Medicine, Military2
- Population2
- Social indicators2
- Water table2
- Aisne-Marne American Cemetery and Memorial (France)1
- Anthropological linguistics1
- Area studies1
- Black Hills War, 1876-18771
- Communicable diseases1
- Demography1
- Disease Outbreaks1
- Epidemics1