Classification
547 - Organic chemistry
471
541 - Physical chemistry
110
546 - Inorganic chemistry
66
572 - Biochemistry
57
620 - Engineering & allied operations
48
543 - Analytical chemistry
27
660 - Chemical engineering
24
540 - Chemistry & allied sciences
21
615 - Pharmacology & therapeutics
19
580 - Plants (Botany)
18
571 - Physiology & related subjects
15
530 - Physics
9
641 - Food & drink
9
664 - Food technology
9
551 - Geology, hydrology & meteorology
7
577 - Ecology
5
363 - Other social problems & services
3
520 - Astronomy & allied sciences
3
548 - Crystallography
3
630 - Agriculture & related technologies
3
500 - Natural sciences & mathematics
2
539 - Modern physics
2
576 - Genetics & evolution
2
616 - Diseases
2
631 - Techniques, equipment & materials
2
003 - Systems
1
070 - News media, journalism & publishing
1
305 - Social groups
1
306 - Culture & institutions
1
333 - Economics of land & energy
1
511 - General principles of mathematics
1
531 - Classical mechanics; solid mechanics
1
537 - Electricity & electronics
1
612 - Human physiology
1
621 - Applied physics
1
624 - Civil engineering
1
628 - Sanitary & municipal engineering
1
670 - Manufacturing
1
686 - Printing & related activities
1
770 - Photography, photographs & computer art
1
900 - History & geography
1