Classification
333 - Economics of land & energy
330 - Economics
115
320 - Political science
84
363 - Other social problems & services
55
900 - History & geography
45
300 - Social sciences
42
370 - Education
41
600 - Technology
41
700 - The arts; fine & decorative arts
39
140 - Specific philosophical schools
33
100 - Philosophy & psychology
28
620 - Engineering & allied operations
22
630 - Agriculture & related technologies
21
340 - Law
18
581 - Specific topics in natural history
18
551 - Geology, hydrology & meteorology
17
610 - Medicine & health
17
380 - Commerce, communications & transportation
14
301 - Sociology & anthropology
9
720 - Architecture
9
000 - Computer science, information & general works
8
580 - Plants (Botany)
7
170 - Ethics
6
400 - Language
6
530 - Physics
6
200 - Religion
5
304 - Factors affecting social behavior
4
361 - Social problems & social welfare in general
4
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
350 - Public administration & military science
3
360 - Social problems & services; associations
3
410 - Linguistics
3
297 - Islam, Babism & Bahai Faith
2
364 - Criminology
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
658 - General management
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
296 - Judaism
1
550 - Earth sciences
1
590 - Animals (Zoology)
1
612 - Human physiology
1