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Colonialism
3
Natural Science Disciplines
3
North America
3
Smallpox
3
Social Sciences
3
Disease Outbreaks
2
Anniversaries and Special Events
1
Autopsy
1
Cathartics
1
Diphtheria
1
Dysentery
1
Health Promotion
1
History, 18th Century
1
Lead Poisoning -- therapy
1
Osteomalacia
1
Religion and Medicine
1
Tar-Water
1