Classification
600 - Technology
12
620 - Engineering & allied operations
12
333 - Economics of land & energy
9
548 - Crystallography
9
900 - History & geography
7
000 - Computer science, information & general works
6
540 - Chemistry & allied sciences
6
700 - The arts; fine & decorative arts
6
380 - Commerce, communications & transportation
4
530 - Physics
3
576 - Genetics & evolution
3
414 - Phonology & phonetics
2
537 - Electricity & electronics
2
621 - Applied physics
2
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
500 - Natural sciences & mathematics
1
541 - Physical chemistry
1
542 - Techniques, equipment & materials
1
546 - Inorganic chemistry
1
547 - Organic chemistry
1
549 - Mineralogy
1
572 - Biochemistry
1
574 - [Unassigned]
1
580 - Plants (Botany)
1
610 - Medicine & health
1
612 - Human physiology
1
623 - Military & nautical engineering
1
660 - Chemical engineering
1
661 - Industrial chemicals
1