Classification
620 - Engineering & allied operations
126
700 - The arts; fine & decorative arts
125
600 - Technology
111
547 - Organic chemistry
84
333 - Economics of land & energy
67
000 - Computer science, information & general works
61
610 - Medicine & health
52
540 - Chemistry & allied sciences
49
668 - Technology of other organic products
45
900 - History & geography
41
363 - Other social problems & services
29
580 - Plants (Botany)
27
380 - Commerce, communications & transportation
21
615 - Pharmacology & therapeutics
21
660 - Chemical engineering
21
414 - Phonology & phonetics
17
621 - Applied physics
15
541 - Physical chemistry
14
576 - Genetics & evolution
14
140 - Specific philosophical schools
13
500 - Natural sciences & mathematics
12
546 - Inorganic chemistry
10
330 - Economics
9
530 - Physics
9
667 - Cleaning, color & coating technologies
7
304 - Factors affecting social behavior
6
630 - Agriculture & related technologies
4
661 - Industrial chemicals
4
720 - Architecture
4
572 - Biochemistry
3
612 - Human physiology
3
681 - Precision instruments & other devices
3
543 - Analytical chemistry
2
570 - Life sciences; biology
2
628 - Sanitary & municipal engineering
2
664 - Food technology
2
678 - Elastomers & elastomer products
2
745 - Decorative arts
2
160 - Logic
1
340 - Law
1
535 - Light & infrared & ultraviolet phenomena
1
539 - Modern physics
1
551 - Geology, hydrology & meteorology
1
574 - [Unassigned]
1
616 - Diseases
1
622 - Mining & related operations
1
623 - Military & nautical engineering
1
647 - Management of public households
1
665 - Industrial oils, fats, waxes & gases
1
670 - Manufacturing
1
more ...