Classification
333 - Economics of land & energy
630 - Agriculture & related technologies
363 - Other social problems & services
142
330 - Economics
133
600 - Technology
104
320 - Political science
95
000 - Computer science, information & general works
83
620 - Engineering & allied operations
78
700 - The arts; fine & decorative arts
67
580 - Plants (Botany)
61
610 - Medicine & health
60
380 - Commerce, communications & transportation
49
551 - Geology, hydrology & meteorology
44
581 - Specific topics in natural history
35
900 - History & geography
33
140 - Specific philosophical schools
27
304 - Factors affecting social behavior
23
340 - Law
15
658 - General management
14
300 - Social sciences
13
370 - Education
13
576 - Genetics & evolution
10
540 - Chemistry & allied sciences
8
720 - Architecture
7
100 - Philosophy & psychology
4
500 - Natural sciences & mathematics
4
530 - Physics
4
800 - Literature & rhetoric
4
170 - Ethics
3
301 - Sociology & anthropology
3
336 - Public finance
3
361 - Social problems & social welfare in general
3
414 - Phonology & phonetics
3
612 - Human physiology
3
657 - Accounting
3
200 - Religion
2
297 - Islam, Babism & Bahai Faith
2
520 - Astronomy & allied sciences
2
400 - Language
1
410 - Linguistics
1