Classification
620 - Engineering & allied operations
292
600 - Technology
141
700 - The arts; fine & decorative arts
96
900 - History & geography
94
667 - Cleaning, color & coating technologies
74
333 - Economics of land & energy
69
000 - Computer science, information & general works
45
540 - Chemistry & allied sciences
42
580 - Plants (Botany)
34
621 - Applied physics
31
363 - Other social problems & services
29
670 - Manufacturing
26
610 - Medicine & health
21
330 - Economics
18
414 - Phonology & phonetics
18
576 - Genetics & evolution
17
530 - Physics
15
500 - Natural sciences & mathematics
14
541 - Physical chemistry
11
340 - Law
10
380 - Commerce, communications & transportation
10
660 - Chemical engineering
5
140 - Specific philosophical schools
4
304 - Factors affecting social behavior
4
551 - Geology, hydrology & meteorology
4
691 - Building materials
4
800 - Literature & rhetoric
4
320 - Political science
3
370 - Education
3
571 - Physiology & related subjects
3
628 - Sanitary & municipal engineering
3
629 - Other branches of engineering
3
543 - Analytical chemistry
2
547 - Organic chemistry
2
579 - Microorganisms, fungi & algae
2
615 - Pharmacology & therapeutics
2
668 - Technology of other organic products
2
671 - Metalworking & primary metal products
2
720 - Architecture
2
780 - Music
2
025 - Library operations
1
170 - Ethics
1
338 - Production
1
352 - General considerations of public administration
1
400 - Language
1
542 - Techniques, equipment & materials
1
546 - Inorganic chemistry
1
574 - [Unassigned]
1
581 - Specific topics in natural history
1
592 - Invertebrates
1
more ...