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North America
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55
Mammals
10
South America
8
Plants
6
Colonialism
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Fossils
3
Humans
3
Natural Science Disciplines
3
Smallpox
3
Social Sciences
3
Africa
2
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2
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Fishes -- classification
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Health Workforce
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Indians, North American
2
Materia Medica
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Plants, Medicinal
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United States
2