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Biosphere reserves
3
Cultivators
1
Diseases
1
Dysentery
1
Enslaved persons
1
Health
1
Important bird areas
3
Leaves
2
Letter writing
1
Letters
1
Medicine
1
Physicians
1
Plants
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[remove]
4
Sick
1
Slave records
1
Soldiers
1
Surgeons
1
Swamps
1
Trees
3
Wilderness areas
3