Classification
600 - Technology
620 - Engineering & allied operations
30
363 - Other social problems & services
24
333 - Economics of land & energy
22
900 - History & geography
21
700 - The arts; fine & decorative arts
20
551 - Geology, hydrology & meteorology
18
320 - Political science
12
330 - Economics
10
000 - Computer science, information & general works
8
380 - Commerce, communications & transportation
6
580 - Plants (Botany)
6
140 - Specific philosophical schools
5
340 - Law
5
610 - Medicine & health
5
576 - Genetics & evolution
4
630 - Agriculture & related technologies
4
304 - Factors affecting social behavior
3
370 - Education
3
581 - Specific topics in natural history
3
300 - Social sciences
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
301 - Sociology & anthropology
1
360 - Social problems & services; associations
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
657 - Accounting
1
658 - General management
1