Classification
330 - Economics
35
610 - Medicine & health
17
370 - Education
14
320 - Political science
10
658 - General management
7
333 - Economics of land & energy
4
361 - Social problems & social welfare in general
4
300 - Social sciences
3
306 - Culture & institutions
3
327 - International relations
3
338 - Production
3
340 - Law
3
363 - Other social problems & services
3
140 - Specific philosophical schools
2
174 - Occupational ethics
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
331 - Labor economics
2
341 - Law of nations
2
540 - Chemistry & allied sciences
2
600 - Technology
2
613 - Personal health & safety
2
616 - Diseases
2
620 - Engineering & allied operations
2
004 - Data processing & computer science
1
100 - Philosophy & psychology
1
155 - Differential & developmental psychology
1
158 - Applied psychology
1
170 - Ethics
1
345 - Criminal law
1
364 - Criminology
1
371 - Schools & their activities; special education
1
384 - Communications; telecommunication
1
500 - Natural sciences & mathematics
1
571 - Physiology & related subjects
1
572 - Biochemistry
1
614 - Incidence & prevention of disease
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
628 - Sanitary & municipal engineering
1
650 - Management & auxiliary services
1
700 - The arts; fine & decorative arts
1
745 - Decorative arts
1
791 - Public performances
1