Classification
500 - Natural sciences & mathematics
530 - Physics
540 - Chemistry & allied sciences
620 - Engineering & allied operations
333 - Economics of land & energy
7
600 - Technology
7
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
4
380 - Commerce, communications & transportation
3
300 - Social sciences
2
363 - Other social problems & services
2
370 - Education
2
576 - Genetics & evolution
2
630 - Agriculture & related technologies
2
900 - History & geography
2
100 - Philosophy & psychology
1
320 - Political science
1
330 - Economics
1
340 - Law
1
520 - Astronomy & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
658 - General management
1
720 - Architecture
1