Classification
333 - Economics of land & energy
363 - Other social problems & services
551 - Geology, hydrology & meteorology
330 - Economics
23
000 - Computer science, information & general works
14
700 - The arts; fine & decorative arts
14
320 - Political science
11
600 - Technology
9
610 - Medicine & health
7
620 - Engineering & allied operations
7
581 - Specific topics in natural history
6
340 - Law
4
370 - Education
4
900 - History & geography
4
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
630 - Agriculture & related technologies
3
720 - Architecture
3
550 - Earth sciences
2
580 - Plants (Botany)
2
658 - General management
2
170 - Ethics
1
300 - Social sciences
1
400 - Language
1
657 - Accounting
1