Classification
551 - Geology, hydrology & meteorology
363 - Other social problems & services
67
330 - Economics
64
000 - Computer science, information & general works
31
333 - Economics of land & energy
27
320 - Political science
25
700 - The arts; fine & decorative arts
19
140 - Specific philosophical schools
13
581 - Specific topics in natural history
13
380 - Commerce, communications & transportation
8
900 - History & geography
7
630 - Agriculture & related technologies
6
600 - Technology
5
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
170 - Ethics
3
300 - Social sciences
3
580 - Plants (Botany)
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
658 - General management
3
340 - Law
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
657 - Accounting
2
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
370 - Education
1
400 - Language
1
576 - Genetics & evolution
1
590 - Animals (Zoology)
1
612 - Human physiology
1