Classification
600 - Technology
900 - History & geography
620 - Engineering & allied operations
69
700 - The arts; fine & decorative arts
48
333 - Economics of land & energy
37
380 - Commerce, communications & transportation
19
610 - Medicine & health
19
000 - Computer science, information & general works
17
363 - Other social problems & services
14
330 - Economics
12
580 - Plants (Botany)
11
500 - Natural sciences & mathematics
9
370 - Education
8
140 - Specific philosophical schools
7
530 - Physics
7
551 - Geology, hydrology & meteorology
7
720 - Architecture
7
320 - Political science
5
414 - Phonology & phonetics
5
576 - Genetics & evolution
5
630 - Agriculture & related technologies
5
540 - Chemistry & allied sciences
4
340 - Law
3
400 - Language
3
550 - Earth sciences
3
658 - General management
2
800 - Literature & rhetoric
2
170 - Ethics
1
410 - Linguistics
1
581 - Specific topics in natural history
1
612 - Human physiology
1
770 - Photography, photographs & computer art
1
780 - Music
1