Classification
515 - Analysis
265
629 - Other branches of engineering
265
003 - Systems
262
519 - Probabilities & applied mathematics
239
620 - Engineering & allied operations
156
004 - Data processing & computer science
120
621 - Applied physics
96
006 - Special computer methods
77
330 - Economics
64
658 - General management
55
600 - Technology
51
510 - Mathematics
49
333 - Economics of land & energy
43
500 - Natural sciences & mathematics
38
518 - Numerical analysis
36
700 - The arts; fine & decorative arts
35
900 - History & geography
34
001 - Knowledge
33
300 - Social sciences
33
000 - Computer science, information & general works
31
005 - Computer programming, programs & data
31
530 - Physics
20
570 - Life sciences; biology
16
576 - Genetics & evolution
15
610 - Medicine & health
15
660 - Chemical engineering
12
363 - Other social problems & services
11
670 - Manufacturing
11
380 - Commerce, communications & transportation
10
512 - Algebra
9
580 - Plants (Botany)
9
140 - Specific philosophical schools
8
332 - Financial economics
8
338 - Production
6
340 - Law
6
516 - Geometry
6
531 - Classical mechanics; solid mechanics
6
551 - Geology, hydrology & meteorology
5
616 - Diseases
5
321 - Systems of governments & states
4
331 - Labor economics
4
540 - Chemistry & allied sciences
4
612 - Human physiology
4
630 - Agriculture & related technologies
4
650 - Management & auxiliary services
4
800 - Literature & rhetoric
4
511 - General principles of mathematics
3
535 - Light & infrared & ultraviolet phenomena
3
539 - Modern physics
3
577 - Ecology
3
more ...