Subject
United States Description and travel
123
United States Discovery and exploration
82
United States History
56
United States Politics and government
35
West (U.S.) Description and travel
33
United States Foreign relations
31
Indians of North America
23
United States History Regimental histories
23
United States Boundaries
22
Canada Description and travel
18
Mexico Boundaries
15
United States
14
Mexican War, 1846-1848
13
Mexico Foreign relations
12
Mississippi River Valley Description and travel
12
United States Emigration and immigration
12
Frontier and pioneer life
11
Geology
11
Natural history
11
United States Commerce
11
Colorado River (Colo.-Mexico)
9
Hunting
9
Louisiana History
9
Postal service
9
Railroads
9
Slavery
9
Spain Foreign relations
9
Northwest, Old Description and travel
8
Public lands
8
Texas History
8
Indians of North America Wars
7
Mexico Description and travel
7
Overland journeys to the Pacific
7
Southwest, New Description and travel
7
Texas Annexation to the United States
7
Alaska Description and travel
6
Fur trade
6
Germans
6
Louisiana Purchase
6
Mines and mineral resources
6
Ohio River Valley Description and travel
6
Texas Description and travel
6
United States Social life and customs
6
Habeas corpus
5
Martial law
5
Missions
5
Mississippi River Commerce
5
Mississippi River Description and travel
5
Missouri History
5
Montana Description and travel
5
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