Classification
621 - Applied physics
272
515 - Analysis
267
620 - Engineering & allied operations
167
530 - Physics
91
006 - Special computer methods
73
519 - Probabilities & applied mathematics
59
600 - Technology
59
700 - The arts; fine & decorative arts
50
004 - Data processing & computer science
48
005 - Computer programming, programs & data
41
500 - Natural sciences & mathematics
41
510 - Mathematics
41
512 - Algebra
41
518 - Numerical analysis
40
541 - Physical chemistry
39
543 - Analytical chemistry
37
000 - Computer science, information & general works
35
610 - Medicine & health
31
572 - Biochemistry
26
333 - Economics of land & energy
25
900 - History & geography
25
003 - Systems
23
547 - Organic chemistry
22
520 - Astronomy & allied sciences
21
616 - Diseases
19
537 - Electricity & electronics
18
540 - Chemistry & allied sciences
18
580 - Plants (Botany)
16
629 - Other branches of engineering
16
363 - Other social problems & services
14
551 - Geology, hydrology & meteorology
14
330 - Economics
13
534 - Sound & related vibrations
13
571 - Physiology & related subjects
13
535 - Light & infrared & ultraviolet phenomena
12
660 - Chemical engineering
12
531 - Classical mechanics; solid mechanics
10
140 - Specific philosophical schools
9
570 - Life sciences; biology
9
001 - Knowledge
8
300 - Social sciences
8
332 - Financial economics
8
384 - Communications; telecommunication
8
516 - Geometry
8
550 - Earth sciences
8
579 - Microorganisms, fungi & algae
8
025 - Library operations
7
414 - Phonology & phonetics
7
511 - General principles of mathematics
7
546 - Inorganic chemistry
7
more ...