Classification
658 - General management
28
302 - Social interaction
20
300 - Social sciences
13
306 - Culture & institutions
13
305 - Social groups
11
005 - Computer programming, programs & data
9
616 - Diseases
7
370 - Education
6
610 - Medicine & health
6
004 - Data processing & computer science
5
320 - Political science
5
338 - Production
5
910 - Geography & travel
5
301 - Sociology & anthropology
4
519 - Probabilities & applied mathematics
4
650 - Management & auxiliary services
4
006 - Special computer methods
3
304 - Factors affecting social behavior
3
620 - Engineering & allied operations
3
621 - Applied physics
3
003 - Systems
2
303 - Social processes
2
361 - Social problems & social welfare in general
2
381 - Commerce
2
510 - Mathematics
2
512 - Algebra
2
615 - Pharmacology & therapeutics
2
617 - Surgery & related medical specialties
2
142 - Critical philosophy
1
150 - Psychology
1
155 - Differential & developmental psychology
1
158 - Applied psychology
1
327 - International relations
1
332 - Financial economics
1
333 - Economics of land & energy
1
362 - Social welfare problems & services
1
363 - Other social problems & services
1
371 - Schools & their activities; special education
1
378 - Higher education
1
379 - Public policy issues in education
1
515 - Analysis
1
530 - Physics
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
572 - Biochemistry
1
576 - Genetics & evolution
1
577 - Ecology
1
579 - Microorganisms, fungi & algae
1
612 - Human physiology
1
614 - Incidence & prevention of disease
1
more ...