Classification
000 - Computer science, information & general works
700 - The arts; fine & decorative arts
163
333 - Economics of land & energy
117
363 - Other social problems & services
107
600 - Technology
103
610 - Medicine & health
92
580 - Plants (Botany)
84
540 - Chemistry & allied sciences
80
620 - Engineering & allied operations
70
330 - Economics
68
630 - Agriculture & related technologies
56
380 - Commerce, communications & transportation
52
140 - Specific philosophical schools
46
300 - Social sciences
41
551 - Geology, hydrology & meteorology
35
576 - Genetics & evolution
35
900 - History & geography
33
500 - Natural sciences & mathematics
30
320 - Political science
25
658 - General management
24
414 - Phonology & phonetics
22
530 - Physics
21
581 - Specific topics in natural history
21
800 - Literature & rhetoric
21
340 - Law
12
370 - Education
12
612 - Human physiology
12
720 - Architecture
12
100 - Philosophy & psychology
11
361 - Social problems & social welfare in general
9
304 - Factors affecting social behavior
8
384 - Communications; telecommunication
6
302 - Social interaction
4
615 - Pharmacology & therapeutics
4
001 - Knowledge
3
150 - Psychology
3
170 - Ethics
3
338 - Production
3
400 - Language
3
590 - Animals (Zoology)
3
153 - Mental processes & intelligence
2
155 - Differential & developmental psychology
2
301 - Sociology & anthropology
2
410 - Linguistics
2
650 - Management & auxiliary services
2
780 - Music
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
331 - Labor economics
1
332 - Financial economics
1
more ...