Classification
330 - Economics
363 - Other social problems & services
600 - Technology
658 - General management
333 - Economics of land & energy
18
620 - Engineering & allied operations
16
700 - The arts; fine & decorative arts
15
000 - Computer science, information & general works
13
380 - Commerce, communications & transportation
9
900 - History & geography
9
610 - Medicine & health
8
140 - Specific philosophical schools
7
320 - Political science
7
580 - Plants (Botany)
7
551 - Geology, hydrology & meteorology
5
576 - Genetics & evolution
5
630 - Agriculture & related technologies
5
370 - Education
4
800 - Literature & rhetoric
4
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
720 - Architecture
2
100 - Philosophy & psychology
1
160 - Logic
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1