Classification
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
74
600 - Technology
70
333 - Economics of land & energy
50
363 - Other social problems & services
35
000 - Computer science, information & general works
25
330 - Economics
23
720 - Architecture
22
610 - Medicine & health
19
380 - Commerce, communications & transportation
18
576 - Genetics & evolution
12
320 - Political science
10
140 - Specific philosophical schools
8
551 - Geology, hydrology & meteorology
8
370 - Education
7
580 - Plants (Botany)
7
800 - Literature & rhetoric
7
340 - Law
6
414 - Phonology & phonetics
6
500 - Natural sciences & mathematics
6
400 - Language
4
630 - Agriculture & related technologies
4
301 - Sociology & anthropology
3
581 - Specific topics in natural history
3
658 - General management
3
100 - Philosophy & psychology
2
170 - Ethics
2
300 - Social sciences
2
410 - Linguistics
2
540 - Chemistry & allied sciences
2
780 - Music
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1