Classification
621 - Applied physics
1,809
620 - Engineering & allied operations
986
530 - Physics
586
535 - Light & infrared & ultraviolet phenomena
320
600 - Technology
303
700 - The arts; fine & decorative arts
284
537 - Electricity & electronics
257
000 - Computer science, information & general works
216
004 - Data processing & computer science
191
539 - Modern physics
176
900 - History & geography
175
333 - Economics of land & energy
165
006 - Special computer methods
156
610 - Medicine & health
149
541 - Physical chemistry
96
380 - Commerce, communications & transportation
90
515 - Analysis
85
540 - Chemistry & allied sciences
70
500 - Natural sciences & mathematics
67
363 - Other social problems & services
65
520 - Astronomy & allied sciences
48
384 - Communications; telecommunication
47
580 - Plants (Botany)
45
140 - Specific philosophical schools
42
543 - Analytical chemistry
41
629 - Other branches of engineering
40
330 - Economics
36
576 - Genetics & evolution
33
670 - Manufacturing
32
414 - Phonology & phonetics
31
003 - Systems
30
547 - Organic chemistry
30
538 - Magnetism
28
551 - Geology, hydrology & meteorology
26
519 - Probabilities & applied mathematics
22
546 - Inorganic chemistry
22
531 - Classical mechanics; solid mechanics
21
571 - Physiology & related subjects
20
800 - Literature & rhetoric
20
005 - Computer programming, programs & data
19
630 - Agriculture & related technologies
19
660 - Chemical engineering
18
681 - Precision instruments & other devices
18
658 - General management
17
745 - Decorative arts
17
340 - Law
15
331 - Labor economics
14
510 - Mathematics
14
320 - Political science
13
570 - Life sciences; biology
13
more ...