Classification
620 - Engineering & allied operations
900 - History & geography
600 - Technology
39
700 - The arts; fine & decorative arts
25
333 - Economics of land & energy
18
363 - Other social problems & services
12
380 - Commerce, communications & transportation
10
551 - Geology, hydrology & meteorology
8
576 - Genetics & evolution
8
000 - Computer science, information & general works
6
320 - Political science
5
330 - Economics
5
340 - Law
5
140 - Specific philosophical schools
3
304 - Factors affecting social behavior
3
414 - Phonology & phonetics
3
530 - Physics
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
300 - Social sciences
1
360 - Social problems & services; associations
1
370 - Education
1
540 - Chemistry & allied sciences
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1