Classification
630 - Agriculture & related technologies
900 - History & geography
600 - Technology
47
620 - Engineering & allied operations
46
700 - The arts; fine & decorative arts
29
580 - Plants (Botany)
19
333 - Economics of land & energy
17
363 - Other social problems & services
17
330 - Economics
15
300 - Social sciences
14
380 - Commerce, communications & transportation
10
000 - Computer science, information & general works
9
320 - Political science
9
610 - Medicine & health
9
140 - Specific philosophical schools
7
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
5
720 - Architecture
5
100 - Philosophy & psychology
4
340 - Law
4
576 - Genetics & evolution
4
301 - Sociology & anthropology
3
400 - Language
3
410 - Linguistics
3
540 - Chemistry & allied sciences
3
658 - General management
3
770 - Photography, photographs & computer art
3
780 - Music
3
170 - Ethics
2
370 - Education
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
338 - Production
1
350 - Public administration & military science
1
530 - Physics
1
612 - Human physiology
1