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Subject
- World War (1914-1918)50
- Battlefields41
- Soldiers34
- Artillery16
- Trenches14
- Intrenchments13
- Military weapons11
- War--Medical aspects11
- War--Relief of sick and wounded11
- Transportation, Military9
- Fortification7
- Animals--War use6
- Battles6
- War casualties6
- Litters4
- Military supplies4
- Prisoners of war4
- War horses4
- Barbed wire3
- Military railroads3