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| Conservation of natural resources -- Planning. (1) |
| Environmental protection -- Planning. (1) |
| Fort Berthold Indian Reservation (N.D.) (1) |
| North Dakota. (1) |
| Oil spills -- Prevention. (1) |
| Oil spills. (1) |
| Restoration ecology. (1) |
| Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota. (1) |