Classification
620 - Engineering & allied operations
600 - Technology
123
658 - General management
108
338 - Production
90
330 - Economics
80
333 - Economics of land & energy
62
363 - Other social problems & services
61
900 - History & geography
58
700 - The arts; fine & decorative arts
56
000 - Computer science, information & general works
41
500 - Natural sciences & mathematics
40
540 - Chemistry & allied sciences
24
610 - Medicine & health
23
621 - Applied physics
23
370 - Education
21
300 - Social sciences
20
380 - Commerce, communications & transportation
19
384 - Communications; telecommunication
17
630 - Agriculture & related technologies
17
320 - Political science
16
140 - Specific philosophical schools
13
580 - Plants (Botany)
12
302 - Social interaction
11
576 - Genetics & evolution
11
720 - Architecture
11
331 - Labor economics
7
340 - Law
7
551 - Geology, hydrology & meteorology
7
530 - Physics
6
304 - Factors affecting social behavior
5
581 - Specific topics in natural history
5
670 - Manufacturing
5
800 - Literature & rhetoric
5
153 - Mental processes & intelligence
4
158 - Applied psychology
4
332 - Financial economics
4
381 - Commerce
4
400 - Language
4
628 - Sanitary & municipal engineering
4
629 - Other branches of engineering
4
650 - Management & auxiliary services
4
745 - Decorative arts
4
005 - Computer programming, programs & data
3
100 - Philosophy & psychology
3
303 - Social processes
3
414 - Phonology & phonetics
3
609 - Historical, geographic & persons treatment
3
001 - Knowledge
2
006 - Special computer methods
2
120 - Epistemology, causation & humankind
2
more ...