Classification
539 - Modern physics
132
530 - Physics
69
333 - Economics of land & energy
24
621 - Applied physics
19
620 - Engineering & allied operations
11
600 - Technology
10
520 - Astronomy & allied sciences
5
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
523 - Specific celestial bodies & phenomena
2
540 - Chemistry & allied sciences
2
541 - Physical chemistry
2
571 - Physiology & related subjects
2
003 - Systems
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
537 - Electricity & electronics
1
547 - Organic chemistry
1
548 - Crystallography
1
580 - Plants (Botany)
1
616 - Diseases
1
629 - Other branches of engineering
1
662 - Explosives, fuels & related products
1
900 - History & geography
1