Classification
155 - Differential & developmental psychology
31
576 - Genetics & evolution
13
100 - Philosophy & psychology
11
153 - Mental processes & intelligence
7
150 - Psychology
5
170 - Ethics
5
300 - Social sciences
5
301 - Sociology & anthropology
5
302 - Social interaction
5
330 - Economics
5
000 - Computer science, information & general works
4
306 - Culture & institutions
4
570 - Life sciences; biology
4
616 - Diseases
4
658 - General management
4
156 - Comparative psychology
3
305 - Social groups
3
612 - Human physiology
3
004 - Data processing & computer science
2
005 - Computer programming, programs & data
2
120 - Epistemology, causation & humankind
2
128 - Humankind
2
171 - Ethical systems
2
303 - Social processes
2
304 - Factors affecting social behavior
2
333 - Economics of land & energy
2
340 - Law
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
501 - Philosophy & theory
2
581 - Specific topics in natural history
2
599 - Mammals
2
003 - Systems
1
111 - Ontology
1
140 - Specific philosophical schools
1
174 - Occupational ethics
1
190 - Modern western philosophy
1
200 - Religion
1
201 - Religious mythology & social theology
1
203 - Public worship & other practices
1
327 - International relations
1
338 - Production
1
339 - Macroeconomics & related topics
1
363 - Other social problems & services
1
364 - Criminology
1
370 - Education
1
400 - Language
1
401 - Philosophy & theory
1
530 - Physics
1
571 - Physiology & related subjects
1
more ...