Classification
000 - Computer science, information & general works
170 - Ethics
330 - Economics
600 - Technology
9
620 - Engineering & allied operations
7
333 - Economics of land & energy
5
900 - History & geography
5
320 - Political science
4
380 - Commerce, communications & transportation
4
610 - Medicine & health
4
370 - Education
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
658 - General management
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
158 - Applied psychology
2
300 - Social sciences
2
340 - Law
2
363 - Other social problems & services
2
650 - Management & auxiliary services
2
720 - Architecture
2
200 - Religion
1
338 - Production
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
630 - Agriculture & related technologies
1
657 - Accounting
1
800 - Literature & rhetoric
1