Classification
610 - Medicine & health
600 - Technology
31
700 - The arts; fine & decorative arts
30
000 - Computer science, information & general works
27
620 - Engineering & allied operations
20
333 - Economics of land & energy
16
363 - Other social problems & services
16
140 - Specific philosophical schools
11
330 - Economics
10
900 - History & geography
9
370 - Education
7
380 - Commerce, communications & transportation
6
500 - Natural sciences & mathematics
6
576 - Genetics & evolution
6
320 - Political science
5
580 - Plants (Botany)
5
658 - General management
5
340 - Law
4
630 - Agriculture & related technologies
4
304 - Factors affecting social behavior
3
551 - Geology, hydrology & meteorology
3
100 - Philosophy & psychology
2
300 - Social sciences
2
400 - Language
2
410 - Linguistics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
615 - Pharmacology & therapeutics
2
720 - Architecture
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
306 - Culture & institutions
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
414 - Phonology & phonetics
1
550 - Earth sciences
1