Classification
620 - Engineering & allied operations
204
667 - Cleaning, color & coating technologies
69
600 - Technology
48
621 - Applied physics
48
700 - The arts; fine & decorative arts
32
900 - History & geography
32
670 - Manufacturing
29
333 - Economics of land & energy
19
000 - Computer science, information & general works
13
530 - Physics
10
540 - Chemistry & allied sciences
9
541 - Physical chemistry
9
576 - Genetics & evolution
8
380 - Commerce, communications & transportation
7
414 - Phonology & phonetics
7
500 - Natural sciences & mathematics
6
580 - Plants (Botany)
6
610 - Medicine & health
6
629 - Other branches of engineering
5
330 - Economics
4
363 - Other social problems & services
3
547 - Organic chemistry
3
571 - Physiology & related subjects
3
630 - Agriculture & related technologies
3
691 - Building materials
3
140 - Specific philosophical schools
2
370 - Education
2
170 - Ethics
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
338 - Production
1
340 - Law
1
352 - General considerations of public administration
1
400 - Language
1
515 - Analysis
1
531 - Classical mechanics; solid mechanics
1
543 - Analytical chemistry
1
579 - Microorganisms, fungi & algae
1
592 - Invertebrates
1
617 - Surgery & related medical specialties
1
660 - Chemical engineering
1
720 - Architecture
1