Classification
600 - Technology
3,045
629 - Other branches of engineering
787
620 - Engineering & allied operations
626
621 - Applied physics
266
500 - Natural sciences & mathematics
170
003 - Systems
113
520 - Astronomy & allied sciences
109
005 - Computer programming, programs & data
72
900 - History & geography
67
006 - Special computer methods
64
004 - Data processing & computer science
62
670 - Manufacturing
53
531 - Classical mechanics; solid mechanics
52
658 - General management
51
700 - The arts; fine & decorative arts
49
333 - Economics of land & energy
48
530 - Physics
39
610 - Medicine & health
37
000 - Computer science, information & general works
31
330 - Economics
27
519 - Probabilities & applied mathematics
27
523 - Specific celestial bodies & phenomena
26
300 - Social sciences
22
540 - Chemistry & allied sciences
22
515 - Analysis
21
341 - Law of nations
19
690 - Buildings
19
001 - Knowledge
17
338 - Production
17
624 - Civil engineering
17
380 - Commerce, communications & transportation
15
518 - Numerical analysis
15
570 - Life sciences; biology
13
910 - Geography & travel
13
363 - Other social problems & services
12
510 - Mathematics
11
616 - Diseases
10
612 - Human physiology
9
745 - Decorative arts
9
331 - Labor economics
8
532 - Fluid mechanics; liquid mechanics
8
533 - Gas mechanics
8
551 - Geology, hydrology & meteorology
8
580 - Plants (Botany)
8
340 - Law
7
571 - Physiology & related subjects
7
576 - Genetics & evolution
7
667 - Cleaning, color & coating technologies
7
414 - Phonology & phonetics
6
387 - Water, air & space transportation
5
more ...