Classification
333 - Economics of land & energy
257
600 - Technology
173
620 - Engineering & allied operations
128
700 - The arts; fine & decorative arts
126
330 - Economics
124
900 - History & geography
110
000 - Computer science, information & general works
89
363 - Other social problems & services
80
380 - Commerce, communications & transportation
68
658 - General management
44
720 - Architecture
39
621 - Applied physics
34
551 - Geology, hydrology & meteorology
31
580 - Plants (Botany)
29
610 - Medicine & health
27
140 - Specific philosophical schools
24
500 - Natural sciences & mathematics
21
320 - Political science
19
530 - Physics
18
576 - Genetics & evolution
17
690 - Buildings
17
338 - Production
14
370 - Education
14
340 - Law
13
540 - Chemistry & allied sciences
11
630 - Agriculture & related technologies
11
800 - Literature & rhetoric
10
624 - Civil engineering
8
670 - Manufacturing
8
657 - Accounting
6
581 - Specific topics in natural history
3
691 - Building materials
3
006 - Special computer methods
2
361 - Social problems & social welfare in general
2
400 - Language
2
414 - Phonology & phonetics
2
577 - Ecology
2
629 - Other branches of engineering
2
650 - Management & auxiliary services
2
660 - Chemical engineering
2
001 - Knowledge
1
005 - Computer programming, programs & data
1
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
200 - Religion
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
307 - Communities
1
344 - Labor, social, education & cultural law
1
410 - Linguistics
1
more ...