Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
12
620 - Engineering & allied operations
9
363 - Other social problems & services
8
333 - Economics of land & energy
7
610 - Medicine & health
7
576 - Genetics & evolution
6
900 - History & geography
6
370 - Education
4
500 - Natural sciences & mathematics
4
658 - General management
4
320 - Political science
3
551 - Geology, hydrology & meteorology
3
630 - Agriculture & related technologies
3
720 - Architecture
3
400 - Language
2
657 - Accounting
2
160 - Logic
1
170 - Ethics
1
200 - Religion
1
340 - Law
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1