Classification
000 - Computer science, information & general works
600 - Technology
65
620 - Engineering & allied operations
65
900 - History & geography
65
700 - The arts; fine & decorative arts
29
333 - Economics of land & energy
27
330 - Economics
14
363 - Other social problems & services
12
610 - Medicine & health
11
380 - Commerce, communications & transportation
10
720 - Architecture
8
320 - Political science
6
140 - Specific philosophical schools
5
658 - General management
5
170 - Ethics
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
370 - Education
3
400 - Language
3
500 - Natural sciences & mathematics
3
770 - Photography, photographs & computer art
3
800 - Literature & rhetoric
3
300 - Social sciences
2
340 - Law
2
410 - Linguistics
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
581 - Specific topics in natural history
1