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الموضوعات: Cheyenne Indians., Cheyenne Indians Economic conditions., Cheyenne Indians Social conditions., Indians of North America Social life and customs. Montana, Coal mines and mining Montana., Coal mines and mining Environmental aspects Montana Northern Cheyenne Indian Reservation., Energy development Montana., Cheyenne., Cheyenne Conditions économiques., Cheyenne Conditions sociales., Peuples autochtones Mœurs et coutumes. Montana, Énergie Développement Montana., Cheyenne Indians., Cheyenne Indians Economic conditions., Cheyenne Indians Social conditions., Coal mines and mining., Coal mines and mining Environmental aspects., Energy development., Indians of North America Social life and customs., Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation, Montana., Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation, Montana., Montana., Montana Northern Cheyenne Indian Reservation.
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