Classification
501 - Philosophy & theory
14
330 - Economics
11
301 - Sociology & anthropology
10
519 - Probabilities & applied mathematics
8
005 - Computer programming, programs & data
7
006 - Special computer methods
7
530 - Physics
7
100 - Philosophy & psychology
5
300 - Social sciences
5
658 - General management
5
160 - Logic
4
500 - Natural sciences & mathematics
4
616 - Diseases
4
140 - Specific philosophical schools
3
149 - Other philosophical systems
3
170 - Ethics
3
190 - Modern western philosophy
3
333 - Economics of land & energy
3
570 - Life sciences; biology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
001 - Knowledge
2
003 - Systems
2
004 - Data processing & computer science
2
110 - Metaphysics
2
142 - Critical philosophy
2
150 - Psychology
2
153 - Mental processes & intelligence
2
155 - Differential & developmental psychology
2
174 - Occupational ethics
2
303 - Social processes
2
370 - Education
2
510 - Mathematics
2
580 - Plants (Botany)
2
601 - Philosophy & theory
2
612 - Human physiology
2
617 - Surgery & related medical specialties
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
630 - Agriculture & related technologies
2
109 - Historical & collected persons treatment
1
128 - Humankind
1
158 - Applied psychology
1
180 - Ancient, medieval & eastern philosophy
1
201 - Religious mythology & social theology
1
302 - Social interaction
1
305 - Social groups
1
306 - Culture & institutions
1
320 - Political science
1
331 - Labor economics
1
338 - Production
1
more ...