Subject
Yellowstone National Park
10
West (U.S.) Description and travel
4
Frontier and pioneer life
2
Fur trade
2
Geology
2
West (U.S.) Discovery and exploration
2
West (U.S.) History
2
Yellowstone National Park History
2
American bison
1
American bison History
1
Art, American
1
Big Horn (Wyo.)
1
Explorers
1
Fur trade History
1
History
1
Mammals
1
Northwestern States
1
Railroad travel
1
Rocky Mountains Description and travel
1
Trappers
1
United States
1
West (U.S.)
1
Wyoming Description and travel
1
Yellowstone National Park Discovery and exploration
1