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Agriculture
1
Conditions environnementales
1
Ecology
1
Environmental conditions
1
Expansion territoriale
Frontier and pioneer life
1
HISTORY / United States / State & Local / Midwest (IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI)
1
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Histoire
1
History
1
Territorial expansion
1
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