Classification
541 - Physical chemistry
252
547 - Organic chemistry
206
620 - Engineering & allied operations
196
621 - Applied physics
92
540 - Chemistry & allied sciences
82
660 - Chemical engineering
59
700 - The arts; fine & decorative arts
59
600 - Technology
48
000 - Computer science, information & general works
47
333 - Economics of land & energy
43
546 - Inorganic chemistry
31
363 - Other social problems & services
28
530 - Physics
17
628 - Sanitary & municipal engineering
17
900 - History & geography
17
500 - Natural sciences & mathematics
16
610 - Medicine & health
14
572 - Biochemistry
13
576 - Genetics & evolution
13
665 - Industrial oils, fats, waxes & gases
13
668 - Technology of other organic products
13
330 - Economics
12
662 - Explosives, fuels & related products
11
580 - Plants (Botany)
10
577 - Ecology
8
661 - Industrial chemicals
8
380 - Commerce, communications & transportation
7
543 - Analytical chemistry
7
574 - [Unassigned]
7
551 - Geology, hydrology & meteorology
5
570 - Life sciences; biology
5
615 - Pharmacology & therapeutics
5
629 - Other branches of engineering
5
720 - Architecture
5
800 - Literature & rhetoric
5
140 - Specific philosophical schools
4
414 - Phonology & phonetics
4
321 - Systems of governments & states
3
630 - Agriculture & related technologies
3
664 - Food technology
3
670 - Manufacturing
3
696 - Utilities
3
338 - Production
2
537 - Electricity & electronics
2
581 - Specific topics in natural history
2
678 - Elastomers & elastomer products
2
025 - Library operations
1
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
160 - Logic
1
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