Classification
620 - Engineering & allied operations
5,436
621 - Applied physics
1,751
629 - Other branches of engineering
538
624 - Civil engineering
445
005 - Computer programming, programs & data
434
670 - Manufacturing
413
658 - General management
341
519 - Probabilities & applied mathematics
245
003 - Systems
218
004 - Data processing & computer science
200
660 - Chemical engineering
192
690 - Buildings
106
530 - Physics
84
363 - Other social problems & services
68
677 - Textiles
60
006 - Special computer methods
58
515 - Analysis
57
531 - Classical mechanics; solid mechanics
55
628 - Sanitary & municipal engineering
50
650 - Management & auxiliary services
45
540 - Chemistry & allied sciences
41
610 - Medicine & health
40
551 - Geology, hydrology & meteorology
34
333 - Economics of land & energy
32
541 - Physical chemistry
31
536 - Heat
30
616 - Diseases
29
510 - Mathematics
27
330 - Economics
22
720 - Architecture
22
500 - Natural sciences & mathematics
21
518 - Numerical analysis
21
509 - Historical, geographic & persons treatment
20
550 - Earth sciences
20
910 - Geography & travel
20
512 - Algebra
19
697 - Heating, ventilating & air-conditioning
19
338 - Production
17
537 - Electricity & electronics
17
543 - Analytical chemistry
16
343 - Military, tax, trade & industrial law
13
516 - Geometry
13
534 - Sound & related vibrations
13
693 - Specific materials & purposes
13
535 - Light & infrared & ultraviolet phenomena
12
520 - Astronomy & allied sciences
11
539 - Modern physics
11
370 - Education
10
571 - Physiology & related subjects
10
577 - Ecology
10
more ...