Classification
333 - Economics of land & energy
900 - History & geography
330 - Economics
9
100 - Philosophy & psychology
8
320 - Political science
8
300 - Social sciences
7
370 - Education
7
610 - Medicine & health
7
140 - Specific philosophical schools
5
363 - Other social problems & services
5
301 - Sociology & anthropology
4
600 - Technology
4
700 - The arts; fine & decorative arts
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
350 - Public administration & military science
1
380 - Commerce, communications & transportation
1
400 - Language
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1