Classification
500 - Natural sciences & mathematics
600 - Technology
620 - Engineering & allied operations
16
630 - Agriculture & related technologies
13
581 - Specific topics in natural history
11
580 - Plants (Botany)
8
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
610 - Medicine & health
6
363 - Other social problems & services
5
540 - Chemistry & allied sciences
4
530 - Physics
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
170 - Ethics
1
300 - Social sciences
1
330 - Economics
1
340 - Law
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
720 - Architecture
1
900 - History & geography
1