Classification
620 - Engineering & allied operations
600 - Technology
206
900 - History & geography
178
700 - The arts; fine & decorative arts
137
333 - Economics of land & energy
123
000 - Computer science, information & general works
69
380 - Commerce, communications & transportation
60
330 - Economics
51
610 - Medicine & health
45
500 - Natural sciences & mathematics
44
363 - Other social problems & services
41
140 - Specific philosophical schools
33
576 - Genetics & evolution
26
580 - Plants (Botany)
24
658 - General management
22
540 - Chemistry & allied sciences
21
530 - Physics
16
621 - Applied physics
16
720 - Architecture
16
340 - Law
14
300 - Social sciences
11
320 - Political science
11
370 - Education
11
414 - Phonology & phonetics
11
551 - Geology, hydrology & meteorology
10
800 - Literature & rhetoric
10
400 - Language
9
384 - Communications; telecommunication
8
630 - Agriculture & related technologies
8
005 - Computer programming, programs & data
6
331 - Labor economics
6
581 - Specific topics in natural history
6
629 - Other branches of engineering
6
170 - Ethics
4
362 - Social welfare problems & services
4
612 - Human physiology
4
745 - Decorative arts
4
100 - Philosophy & psychology
3
304 - Factors affecting social behavior
3
667 - Cleaning, color & coating technologies
3
001 - Knowledge
2
302 - Social interaction
2
338 - Production
2
355 - Military science
2
660 - Chemical engineering
2
770 - Photography, photographs & computer art
2
004 - Data processing & computer science
1
200 - Religion
1
303 - Social processes
1
332 - Financial economics
1
more ...