Classification
600 - Technology
11,953
621 - Applied physics
1,929
006 - Special computer methods
358
620 - Engineering & allied operations
206
610 - Medicine & health
131
629 - Other branches of engineering
116
004 - Data processing & computer science
94
700 - The arts; fine & decorative arts
58
534 - Sound & related vibrations
57
005 - Computer programming, programs & data
53
519 - Probabilities & applied mathematics
53
003 - Systems
52
515 - Analysis
49
000 - Computer science, information & general works
38
900 - History & geography
37
510 - Mathematics
29
500 - Natural sciences & mathematics
26
530 - Physics
25
333 - Economics of land & energy
24
380 - Commerce, communications & transportation
23
140 - Specific philosophical schools
22
384 - Communications; telecommunication
22
910 - Geography & travel
18
520 - Astronomy & allied sciences
16
612 - Human physiology
15
616 - Diseases
14
363 - Other social problems & services
11
511 - General principles of mathematics
11
535 - Light & infrared & ultraviolet phenomena
11
580 - Plants (Botany)
11
658 - General management
9
025 - Library operations
8
410 - Linguistics
8
518 - Numerical analysis
8
570 - Life sciences; biology
7
571 - Physiology & related subjects
7
781 - General principles & musical forms
7
800 - Literature & rhetoric
7
330 - Economics
6
340 - Law
6
414 - Phonology & phonetics
6
660 - Chemical engineering
6
780 - Music
6
523 - Specific celestial bodies & phenomena
5
670 - Manufacturing
5
745 - Decorative arts
5
300 - Social sciences
4
537 - Electricity & electronics
4
576 - Genetics & evolution
4
630 - Agriculture & related technologies
4
more ...