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Smallpox -- prevention & control
7
Cowpox
6
Philadelphia
6
Phytotherapy
6
Chemistry
4
Disease Outbreaks
4
Midwifery
4
Obstetrics
4
Anatomy
3
Disease
3
Equipment and Supplies
3
Medicine
3
Models, Anatomic
3
Ruysch, Frederik, 1638-1731.
3
United States
3
Electricity
2
England
2
Environmental Medicine
2
Fever
2
Hospitals, Military
2