Classification
630 - Agriculture & related technologies
900 - History & geography
330 - Economics
122
320 - Political science
109
600 - Technology
84
620 - Engineering & allied operations
79
300 - Social sciences
50
700 - The arts; fine & decorative arts
45
333 - Economics of land & energy
33
580 - Plants (Botany)
28
363 - Other social problems & services
24
610 - Medicine & health
19
340 - Law
17
140 - Specific philosophical schools
15
380 - Commerce, communications & transportation
12
551 - Geology, hydrology & meteorology
11
000 - Computer science, information & general works
10
576 - Genetics & evolution
10
800 - Literature & rhetoric
9
581 - Specific topics in natural history
8
200 - Religion
7
370 - Education
7
100 - Philosophy & psychology
5
658 - General management
5
304 - Factors affecting social behavior
4
770 - Photography, photographs & computer art
4
301 - Sociology & anthropology
3
338 - Production
3
400 - Language
3
720 - Architecture
3
170 - Ethics
2
410 - Linguistics
2
540 - Chemistry & allied sciences
2
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
612 - Human physiology
1
657 - Accounting
1
780 - Music
1