Classification
333 - Economics of land & energy
15
620 - Engineering & allied operations
720 - Architecture
900 - History & geography
700 - The arts; fine & decorative arts
13
600 - Technology
12
000 - Computer science, information & general works
11
330 - Economics
7
363 - Other social problems & services
5
380 - Commerce, communications & transportation
5
320 - Political science
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
370 - Education
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
170 - Ethics
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
500 - Natural sciences & mathematics
1
658 - General management
1