Classification
370 - Education
610 - Medicine & health
700 - The arts; fine & decorative arts
900 - History & geography
333 - Economics of land & energy
9
600 - Technology
9
330 - Economics
8
380 - Commerce, communications & transportation
6
620 - Engineering & allied operations
6
320 - Political science
5
363 - Other social problems & services
5
000 - Computer science, information & general works
4
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
551 - Geology, hydrology & meteorology
3
720 - Architecture
3
140 - Specific philosophical schools
2
200 - Religion
2
360 - Social problems & services; associations
2
400 - Language
2
540 - Chemistry & allied sciences
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
301 - Sociology & anthropology
1
340 - Law
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
612 - Human physiology
1
658 - General management
1