Subject
Africa, North
3
Anthropology Research
2
Archaeology Methodology
1
Armed Forces Officers
1
Art History
1
Art and architecture
1
Art, Ancient
1
Art, Classical
1
Art, Medieval
1
Astronomy
1
Biography
5
Chemistry Experiments
1
Civil rights
2
Civilization, Ancient
Comparative government
2
Cultural geography
3
Earth sciences
12
Economics
2
Europe History
4
Experiments
1
Geography
12
History, Ancient
4
Human geography
5
Indians of North America History
1
International economic relations
2
International relations
3
Liberty
2
Life sciences
2
Middle East History
2
Military history
3
Military history, Ancient
1
Outer space Exploration
1
Paleontology
1
Physical sciences
1
Political geography
2
Political science
1
Politicians
1
Population geography
3
Religion
1
Religious adherents
1
Science Experiments
1
Social institutions
3
Space flight
1
U.S. states Politics and government
2
Women's studies
2
World history
44
World politics
3