Classification
380 - Commerce, communications & transportation
610 - Medicine & health
700 - The arts; fine & decorative arts
156
333 - Economics of land & energy
134
000 - Computer science, information & general works
117
363 - Other social problems & services
106
140 - Specific philosophical schools
99
600 - Technology
89
330 - Economics
85
304 - Factors affecting social behavior
72
370 - Education
62
900 - History & geography
55
580 - Plants (Botany)
54
620 - Engineering & allied operations
54
320 - Political science
42
576 - Genetics & evolution
42
658 - General management
25
551 - Geology, hydrology & meteorology
24
612 - Human physiology
24
340 - Law
23
400 - Language
23
500 - Natural sciences & mathematics
22
720 - Architecture
22
540 - Chemistry & allied sciences
20
100 - Philosophy & psychology
18
300 - Social sciences
17
615 - Pharmacology & therapeutics
16
630 - Agriculture & related technologies
15
800 - Literature & rhetoric
14
170 - Ethics
13
581 - Specific topics in natural history
9
410 - Linguistics
8
414 - Phonology & phonetics
6
200 - Religion
5
616 - Diseases
5
301 - Sociology & anthropology
4
361 - Social problems & social welfare in general
4
362 - Social welfare problems & services
3
336 - Public finance
2
364 - Criminology
2
530 - Physics
2
590 - Animals (Zoology)
2
614 - Incidence & prevention of disease
2
780 - Music
2
296 - Judaism
1
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
360 - Social problems & services; associations
1
384 - Communications; telecommunication
1
394 - General customs
1
more ...