Classification
370 - Education
330 - Economics
625
320 - Political science
347
610 - Medicine & health
216
333 - Economics of land & energy
176
304 - Factors affecting social behavior
165
600 - Technology
136
363 - Other social problems & services
76
300 - Social sciences
73
700 - The arts; fine & decorative arts
62
900 - History & geography
62
380 - Commerce, communications & transportation
50
140 - Specific philosophical schools
45
000 - Computer science, information & general works
33
100 - Philosophy & psychology
30
630 - Agriculture & related technologies
28
620 - Engineering & allied operations
27
551 - Geology, hydrology & meteorology
24
200 - Religion
22
340 - Law
21
658 - General management
17
170 - Ethics
14
500 - Natural sciences & mathematics
11
336 - Public finance
10
400 - Language
10
576 - Genetics & evolution
10
301 - Sociology & anthropology
9
720 - Architecture
8
410 - Linguistics
7
800 - Literature & rhetoric
7
581 - Specific topics in natural history
6
297 - Islam, Babism & Bahai Faith
5
361 - Social problems & social welfare in general
5
580 - Plants (Botany)
5
780 - Music
5
530 - Physics
3
657 - Accounting
3
120 - Epistemology, causation & humankind
2
350 - Public administration & military science
2
360 - Social problems & services; associations
2
371 - Schools & their activities; special education
2
414 - Phonology & phonetics
2
612 - Human physiology
2
770 - Photography, photographs & computer art
2
153 - Mental processes & intelligence
1
160 - Logic
1
331 - Labor economics
1
338 - Production
1
519 - Probabilities & applied mathematics
1
540 - Chemistry & allied sciences
1
more ...