Subject
Pacific railroads Early projects
55
Pacific railroads
42
Pacific railroads Explorations and surveys
13
Railroads
12
West (U.S.) Description and travel
10
Southwest, New Description and travel
5
Explorations and surveys
4
Texas Description and travel
4
United States Description and travel
3
West (U.S.)
3
West (U.S.) History
3
Canada Description and travel
2
Indians of North America
2
Indians of North America Wars
2
Northwestern States
2
Northwestern States Description and travel
2
Oregon History
2
Pacific railroads Finance
2
Pacific railroads History
2
Physical geography
2
Railroad bridges
2
Railroads History
2
Roads
2
Canada Colonization
1
Canals, Interoceanic
1
Cities and towns History
1
Coal mines and mining
1
Consolidation and merger of corporations
1
Ellsworth (Kan.)
1
Frontier and pioneer life
1
Geology
1
Golden Spike National Historical Park (Utah)
1
Idaho Economic conditions
1
Inland navigation
1
Inland water transportation
1
Kansas Description and travel
1
Latter Day Saints
1
Law and legislation
1
Mines and mineral resources
1
National parks and reserves
1
Northwest boundary of the United States
1
Northwest, Pacific
1
Overland journeys to the Pacific
1
Postal service
1
Public lands
1
Puget Sound (Wash.)
1
Railroads Design and construction
1
Railroads Mergers
1
Rocky Mountains
1
San Francisco (Calif.) Politics and government
1
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