SUBJECT
Congresses
130
Politics and government
52
Research
36
History
29
Presidents
29
Legislators
28
Transportation
24
Foreign relations
23
Electronic books
21
Finance
21
Government policy
19
United States. Congress
18
Planning
17
Local transit
16
Economic aspects
15
Foreign economic relations
15
United States
15
Study and teaching
14
Traffic safety
14
Economic conditions
13
Relations
13
Roads
13
Elections
12
Election
11
Executive power
11
Legislation
11
Social aspects
11
Urban transportation
11
Committees
10
Congress
10
Education
10
Powers and duties
10
Libraries
9
Monetary policy
9
Philosophy
9
Technological innovations
9
Traffic engineering
9
Transportation and state
9
Education, Higher
8
Law and legislation
8
Science
8
Taxation
8
Transportation planning
8
Voting
8
Agriculture and state
7
Economic policy
7
Election districts
7
Environmental aspects
7
Environmental policy
7
Income distribution
7
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