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disease × 60middle-ages × 11
medicine × 11
native-americans × 7
united-states × 6
europe × 6
public-health × 4
ancient-history × 3
world-war-one × 3
ancient-greece × 3
military × 2
20th-century × 2
ancient-rome × 2
economy × 2
england × 2
france × 2
warfare × 2
18th-century × 2
colonial-america × 2
africa × 2
age-of-discovery × 2
death × 2
americas × 2
new-world × 2
statistics × 2