Classification
400 - Language
600 - Technology
000 - Computer science, information & general works
20
700 - The arts; fine & decorative arts
17
620 - Engineering & allied operations
15
900 - History & geography
14
140 - Specific philosophical schools
11
576 - Genetics & evolution
10
330 - Economics
8
380 - Commerce, communications & transportation
8
610 - Medicine & health
8
333 - Economics of land & energy
7
720 - Architecture
6
363 - Other social problems & services
5
370 - Education
5
100 - Philosophy & psychology
2
300 - Social sciences
2
320 - Political science
2
340 - Law
2
410 - Linguistics
2
530 - Physics
2
580 - Plants (Botany)
2
658 - General management
2
160 - Logic
1
301 - Sociology & anthropology
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
630 - Agriculture & related technologies
1
780 - Music
1