Classification
543 - Analytical chemistry
56
621 - Applied physics
28
629 - Other branches of engineering
13
620 - Engineering & allied operations
8
530 - Physics
6
003 - Systems
5
539 - Modern physics
4
541 - Physical chemistry
4
616 - Diseases
3
502 - Miscellany
2
520 - Astronomy & allied sciences
2
537 - Electricity & electronics
2
547 - Organic chemistry
2
571 - Physiology & related subjects
2
500 - Natural sciences & mathematics
1
510 - Mathematics
1
535 - Light & infrared & ultraviolet phenomena
1
542 - Techniques, equipment & materials
1
610 - Medicine & health
1
611 - Human anatomy, cytology & histology
1
630 - Agriculture & related technologies
1
658 - General management
1
693 - Specific materials & purposes
1