Classification
523 - Specific celestial bodies & phenomena
4
520 - Astronomy & allied sciences
3
551 - Geology, hydrology & meteorology
2
616 - Diseases
2
000 - Computer science, information & general works
1
003 - Systems
1
004 - Data processing & computer science
1
330 - Economics
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
571 - Physiology & related subjects
1
580 - Plants (Botany)
1
610 - Medicine & health
1
621 - Applied physics
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1