Classification
541 - Physical chemistry
176
543 - Analytical chemistry
34
536 - Heat
20
546 - Inorganic chemistry
20
620 - Engineering & allied operations
20
530 - Physics
16
621 - Applied physics
11
539 - Modern physics
9
660 - Chemical engineering
7
551 - Geology, hydrology & meteorology
6
547 - Organic chemistry
5
641 - Food & drink
5
664 - Food technology
5
363 - Other social problems & services
3
572 - Biochemistry
3
519 - Probabilities & applied mathematics
2
549 - Mineralogy
2
004 - Data processing & computer science
1
370 - Education
1
500 - Natural sciences & mathematics
1
507 - Education, research & related topics
1
523 - Specific celestial bodies & phenomena
1
531 - Classical mechanics; solid mechanics
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
538 - Magnetism
1
571 - Physiology & related subjects
1
616 - Diseases
1
691 - Building materials
1