Classification
000 - Computer science, information & general works
900 - History & geography
600 - Technology
23
620 - Engineering & allied operations
22
333 - Economics of land & energy
18
700 - The arts; fine & decorative arts
18
330 - Economics
9
380 - Commerce, communications & transportation
8
580 - Plants (Botany)
8
576 - Genetics & evolution
7
610 - Medicine & health
6
140 - Specific philosophical schools
4
320 - Political science
4
363 - Other social problems & services
4
581 - Specific topics in natural history
4
530 - Physics
3
304 - Factors affecting social behavior
2
340 - Law
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
720 - Architecture
2
200 - Religion
1
300 - Social sciences
1
361 - Social problems & social welfare in general
1
370 - Education
1
400 - Language
1
410 - Linguistics
1
551 - Geology, hydrology & meteorology
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1