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World War I
12
United States
8
France
5
Military Medicine
5
Military Personnel
5
Sexual Behavior
4
United Kingdom
4
Contraception
3
Hospitals, Military
3
Hygiene
3
Military Hygiene
3
Military Nursing
3
Ambulances
2
Chemical Phenomena
2
Chemistry
2
Curriculum
2
Disabled Persons -- rehabilitation
2
England
2
Eugenics
2
Facial Expression
2