Classification
547 - Organic chemistry
731
620 - Engineering & allied operations
144
541 - Physical chemistry
138
546 - Inorganic chemistry
71
572 - Biochemistry
59
540 - Chemistry & allied sciences
52
660 - Chemical engineering
44
664 - Food technology
40
615 - Pharmacology & therapeutics
36
543 - Analytical chemistry
35
641 - Food & drink
30
530 - Physics
12
571 - Physiology & related subjects
12
580 - Plants (Botany)
12
500 - Natural sciences & mathematics
10
577 - Ecology
9
551 - Geology, hydrology & meteorology
7
628 - Sanitary & municipal engineering
6
363 - Other social problems & services
5
610 - Medicine & health
5
621 - Applied physics
5
631 - Techniques, equipment & materials
5
333 - Economics of land & energy
4
576 - Genetics & evolution
4
661 - Industrial chemicals
4
548 - Crystallography
3
612 - Human physiology
3
630 - Agriculture & related technologies
3
670 - Manufacturing
3
320 - Political science
2
330 - Economics
2
520 - Astronomy & allied sciences
2
539 - Modern physics
2
542 - Techniques, equipment & materials
2
616 - Diseases
2
668 - Technology of other organic products
2
000 - Computer science, information & general works
1
003 - Systems
1
174 - Occupational ethics
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
338 - Production
1
518 - Numerical analysis
1
523 - Specific celestial bodies & phenomena
1
531 - Classical mechanics; solid mechanics
1
537 - Electricity & electronics
1
570 - Life sciences; biology
1
578 - Natural history of organisms
1
581 - Specific topics in natural history
1
613 - Personal health & safety
1
more ...