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Subject
- Psychological aspects[remove]26
- Soldiers26
- Mental health20
- History16
- War neuroses12
- World War, 1914-191810
- Military psychiatry9
- Post-traumatic stress disorder8
- Psychiatry6
- Electrification4
- Electrotherapeutics4
- Employees4
- Industrialization4
- Medical care4
- Mental fatigue4
- Neurasthenia4
- Railroads4
- Social aspects4
- Social change4
- Telephone operators4