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Subject
- World War (1914-1918)45
- Battlefields35
- Soldiers30
- Artillery16
- Intrenchments12
- Trenches12
- Military weapons11
- Transportation, Military9
- War--Medical aspects7
- War--Relief of sick and wounded7
- Battles6
- Fortification6
- War casualties6
- Animals--War use5
- Military supplies4
- Prisoners of war4
- Military railroads3
- Military supplies--Transportation3
- Soldiers--Recreation3
- War horses3