Classification
500 - Natural sciences & mathematics
620 - Engineering & allied operations
005 - Computer programming, programs & data
1,066
384 - Communications; telecommunication
537
331 - Labor economics
443
658 - General management
405
000 - Computer science, information & general works
282
004 - Data processing & computer science
270
745 - Decorative arts
242
006 - Special computer methods
201
330 - Economics
171
600 - Technology
139
621 - Applied physics
118
374 - Adult education
106
900 - History & geography
92
333 - Economics of land & energy
79
700 - The arts; fine & decorative arts
75
302 - Social interaction
65
300 - Social sciences
64
363 - Other social problems & services
54
338 - Production
45
510 - Mathematics
44
670 - Manufacturing
43
380 - Commerce, communications & transportation
42
660 - Chemical engineering
32
629 - Other branches of engineering
29
576 - Genetics & evolution
27
003 - Systems
26
530 - Physics
26
610 - Medicine & health
26
770 - Photography, photographs & computer art
24
140 - Specific philosophical schools
23
370 - Education
23
381 - Commerce
22
519 - Probabilities & applied mathematics
22
720 - Architecture
21
580 - Plants (Botany)
18
340 - Law
15
540 - Chemistry & allied sciences
15
303 - Social processes
14
794 - Indoor games of skill
14
551 - Geology, hydrology & meteorology
12
001 - Knowledge
10
581 - Specific topics in natural history
10
400 - Language
9
414 - Phonology & phonetics
9
650 - Management & auxiliary services
8
664 - Food technology
8
790 - Recreational & performing arts
8
808 - Rhetoric & collections of literature
8
more ...