Classification
320 - Political science
52
330 - Economics
49
658 - General management
35
333 - Economics of land & energy
29
300 - Social sciences
21
338 - Production
21
304 - Factors affecting social behavior
15
340 - Law
13
306 - Culture & institutions
12
900 - History & geography
12
000 - Computer science, information & general works
11
301 - Sociology & anthropology
11
363 - Other social problems & services
10
620 - Engineering & allied operations
10
006 - Special computer methods
9
302 - Social interaction
9
327 - International relations
8
551 - Geology, hydrology & meteorology
8
004 - Data processing & computer science
7
621 - Applied physics
7
140 - Specific philosophical schools
6
305 - Social groups
6
331 - Labor economics
6
344 - Labor, social, education & cultural law
6
500 - Natural sciences & mathematics
6
700 - The arts; fine & decorative arts
6
303 - Social processes
5
307 - Communities
5
341 - Law of nations
5
364 - Criminology
5
370 - Education
5
600 - Technology
5
610 - Medicine & health
5
616 - Diseases
5
361 - Social problems & social welfare in general
4
577 - Ecology
4
613 - Personal health & safety
4
170 - Ethics
3
174 - Occupational ethics
3
332 - Financial economics
3
381 - Commerce
3
512 - Algebra
3
516 - Geometry
3
572 - Biochemistry
3
614 - Incidence & prevention of disease
3
617 - Surgery & related medical specialties
3
650 - Management & auxiliary services
3
670 - Manufacturing
3
959 - Southeast Asia
3
200 - Religion
2
more ...