Classification
006 - Special computer methods
232
331 - Labor economics
227
500 - Natural sciences & mathematics
227
519 - Probabilities & applied mathematics
49
000 - Computer science, information & general works
36
005 - Computer programming, programs & data
31
612 - Human physiology
16
621 - Applied physics
15
530 - Physics
12
620 - Engineering & allied operations
11
629 - Other branches of engineering
11
153 - Mental processes & intelligence
9
570 - Life sciences; biology
9
003 - Systems
8
510 - Mathematics
7
515 - Analysis
7
004 - Data processing & computer science
5
610 - Medicine & health
5
745 - Decorative arts
5
330 - Economics
4
658 - General management
4
001 - Knowledge
3
120 - Epistemology, causation & humankind
2
150 - Psychology
2
332 - Financial economics
2
363 - Other social problems & services
2
368 - Insurance
2
410 - Linguistics
2
511 - General principles of mathematics
2
512 - Algebra
2
518 - Numerical analysis
2
551 - Geology, hydrology & meteorology
2
571 - Physiology & related subjects
2
025 - Library operations
1
030 - General encyclopedic works
1
040 - [Unassigned]
1
174 - Occupational ethics
1
301 - Sociology & anthropology
1
338 - Production
1
384 - Communications; telecommunication
1
401 - Philosophy & theory
1
418 - Standard usage & applied linguistics
1
501 - Philosophy & theory
1
535 - Light & infrared & ultraviolet phenomena
1
542 - Techniques, equipment & materials
1
547 - Organic chemistry
1
572 - Biochemistry
1
576 - Genetics & evolution
1
611 - Human anatomy, cytology & histology
1
616 - Diseases
1
more ...