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- North Dakota 39
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- Northern Pacific Railroad--Railroad snowplows 10
- Snow 8
- Snow--Dakota Territory 8
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- Winter storms 7
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- North Dakota 5
- Camps--Dakota Territory 3
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- Grain elevators--Dakota Territory 1
- Great Northern Railway Company (U.S.)--North Dakota 1
- Harvesting 1
- Historic sites--Dakota Territory 1
- Immigrant Families--North Dakota 1
- Mandan,North Dakota 1
- Northern Pacific Railroad 1
- Northern Pacific Railroad Company 1
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- Omemee,North Dakota 1
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- Potatoes in art 1
- Railroad construction and maintenance--North Dakota 1
- Railroad construction workers 1
- Railroad engineering--Dakota Territory 1
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- Sherwood,North Dakota 1
- Sowing 1
- Stanley,North Dakota 1
- Surveyors 1
- Tents--Dakota Territory 1
- Towner,North Dakota 1
- Trains 1
- Trees, Fossil--Dakota Territory 1
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- Bozeman Trail -- Maps 1
- Dams -- Montana 1
- Dams -- North Dakota 1
- Historical geography -- Maps 1
- Indian reservations -- Montana -- Maps 1
- Irrigation -- Montana -- Dawson County -- Maps 1
- Irrigation -- Montana -- Valley County -- Maps 1
- Irrigation -- North Dakota -- Billings County -- Maps 1
- Irrigation -- North Dakota -- McKenzie County -- Maps 1
- Irrigation -- North Dakota -- Williams County -- Maps 1
- Montana -- Maps 1
- Nez Perce Indians -- History -- Maps 1
- Nez Perce Indians -- Wars, 1877 -- Maps 1
- North Dakota -- Maps, Tourist 1
- Roads -- Maps -- North Dakota 1
- Trails -- West (U.S.) -- Maps 1
- United States -- Maps 1
- Water resources development -- Montana 1
- Water resources development -- North Dakota 1
- West (U.S.) -- Maps 1
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- PDF Document7
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- North Dakota 7
- Montana 3
- Mountain Plains Region 3
- South Dakota 2
- Cheyenne River Indian Reservation (S.D.) 1
- Crow Creek Indian Reservation (S.D.) 1
- Fort Berthold Indian Reservation (N.D.) 1
- Idaho 1
- Lower Brule Indian Reservation (S.D.) 1
- Minnesota 1
- Missouri River Watershed 1
- Nebraska 1
- Oregon 1
- Rocky Boy's Reservation, Montana 1
- Standing Rock Indian Reservation (N.D. and S.D.) 1
- Turtle Mountain Indian Reservation (N.D.) 1
- Washington 1
- Wisconsin 1
- Wyoming 1
- Yankton Indian Reservation (S.D.) 1
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- Video3
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- Bear Cubs 2
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- Travel 2
- American Sign Language 1
- Animals 1
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- Blindness 1
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- Disabilities 1
- Elk 1
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- Hiking 1
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- Interviews--Montana 1
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- Squirrels 1
- Waterfalls 1
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- North Dakota 3
- Montana 2
- Yellowstone National Park 2
- Billings, Montana 1
- Crater Lake National Park 1
- Grand Canyon of the Yellowstone, Wyoming 1
- Lamar Valley, Wyoming 1
- Minnesota 1
- Mount Hood National Forest 1
- Oregon 1
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- Tower Fall, Wyoming 1
- Upper Falls of the Yellowstone River, Wyoming 1
- Washington 1
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