Classification
333 - Economics of land & energy
7
380 - Commerce, communications & transportation
576 - Genetics & evolution
610 - Medicine & health
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
6
620 - Engineering & allied operations
6
000 - Computer science, information & general works
4
720 - Architecture
4
140 - Specific philosophical schools
3
330 - Economics
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
800 - Literature & rhetoric
3
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
410 - Linguistics
1
540 - Chemistry & allied sciences
1