Classification
320 - Political science
363 - Other social problems & services
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
9
333 - Economics of land & energy
8
330 - Economics
7
620 - Engineering & allied operations
7
720 - Architecture
7
000 - Computer science, information & general works
6
140 - Specific philosophical schools
6
370 - Education
5
340 - Law
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
300 - Social sciences
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
580 - Plants (Botany)
1
658 - General management
1