Classification
620 - Engineering & allied operations
825
621 - Applied physics
276
530 - Physics
104
629 - Other branches of engineering
94
531 - Classical mechanics; solid mechanics
75
515 - Analysis
37
660 - Chemical engineering
30
003 - Systems
23
518 - Numerical analysis
23
333 - Economics of land & energy
21
624 - Civil engineering
18
532 - Fluid mechanics; liquid mechanics
15
600 - Technology
14
519 - Probabilities & applied mathematics
12
610 - Medicine & health
12
700 - The arts; fine & decorative arts
12
536 - Heat
11
571 - Physiology & related subjects
11
670 - Manufacturing
11
000 - Computer science, information & general works
10
551 - Geology, hydrology & meteorology
9
363 - Other social problems & services
8
550 - Earth sciences
7
627 - Hydraulic engineering
6
500 - Natural sciences & mathematics
5
900 - History & geography
5
380 - Commerce, communications & transportation
4
534 - Sound & related vibrations
4
667 - Cleaning, color & coating technologies
4
006 - Special computer methods
3
370 - Education
3
535 - Light & infrared & ultraviolet phenomena
3
628 - Sanitary & municipal engineering
3
697 - Heating, ventilating & air-conditioning
3
140 - Specific philosophical schools
2
509 - Historical, geographic & persons treatment
2
510 - Mathematics
2
512 - Algebra
2
526 - Mathematical geography
2
541 - Physical chemistry
2
004 - Data processing & computer science
1
120 - Epistemology, causation & humankind
1
300 - Social sciences
1
330 - Economics
1
340 - Law
1
516 - Geometry
1
537 - Electricity & electronics
1
540 - Chemistry & allied sciences
1
542 - Techniques, equipment & materials
1
547 - Organic chemistry
1
more ...