Classification
500 - Natural sciences & mathematics
600 - Technology
333 - Economics of land & energy
7
620 - Engineering & allied operations
7
700 - The arts; fine & decorative arts
7
000 - Computer science, information & general works
6
900 - History & geography
6
330 - Economics
4
363 - Other social problems & services
3
610 - Medicine & health
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
340 - Law
2
370 - Education
2
380 - Commerce, communications & transportation
2
300 - Social sciences
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1