Classification
900 - History & geography
600 - Technology
101
620 - Engineering & allied operations
91
700 - The arts; fine & decorative arts
74
333 - Economics of land & energy
42
330 - Economics
32
000 - Computer science, information & general works
28
380 - Commerce, communications & transportation
28
800 - Literature & rhetoric
26
363 - Other social problems & services
20
140 - Specific philosophical schools
16
320 - Political science
16
610 - Medicine & health
15
300 - Social sciences
14
370 - Education
14
100 - Philosophy & psychology
13
580 - Plants (Botany)
13
340 - Law
12
500 - Natural sciences & mathematics
11
576 - Genetics & evolution
10
301 - Sociology & anthropology
8
400 - Language
7
200 - Religion
6
530 - Physics
6
551 - Geology, hydrology & meteorology
6
630 - Agriculture & related technologies
6
720 - Architecture
6
304 - Factors affecting social behavior
5
414 - Phonology & phonetics
5
540 - Chemistry & allied sciences
5
581 - Specific topics in natural history
5
658 - General management
5
780 - Music
5
170 - Ethics
3
410 - Linguistics
3
770 - Photography, photographs & computer art
3
297 - Islam, Babism & Bahai Faith
2
791 - Public performances
2
520 - Astronomy & allied sciences
1
590 - Animals (Zoology)
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1