Classification
320 - Political science
15
302 - Social interaction
3
327 - International relations
3
333 - Economics of land & energy
3
973 - United States
3
300 - Social sciences
2
322 - Relation of state to organized groups
2
330 - Economics
2
338 - Production
2
340 - Law
2
520 - Astronomy & allied sciences
2
658 - General management
2
000 - Computer science, information & general works
1
005 - Computer programming, programs & data
1
155 - Differential & developmental psychology
1
158 - Applied psychology
1
321 - Systems of governments & states
1
339 - Macroeconomics & related topics
1
342 - Constitutional & administrative law
1
386 - Inland waterway & ferry transportation
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
509 - Historical, geographic & persons treatment
1
600 - Technology
1
610 - Medicine & health
1
613 - Personal health & safety
1
614 - Incidence & prevention of disease
1
615 - Pharmacology & therapeutics
1
617 - Surgery & related medical specialties
1
620 - Engineering & allied operations
1
623 - Military & nautical engineering
1
624 - Civil engineering
1
629 - Other branches of engineering
1
650 - Management & auxiliary services
1
800 - Literature & rhetoric
1
909 - World history
1