Classification
600 - Technology
363 - Other social problems & services
9
620 - Engineering & allied operations
9
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
100 - Philosophy & psychology
5
330 - Economics
5
551 - Geology, hydrology & meteorology
5
700 - The arts; fine & decorative arts
5
320 - Political science
4
900 - History & geography
4
140 - Specific philosophical schools
2
170 - Ethics
2
300 - Social sciences
2
301 - Sociology & anthropology
2
370 - Education
2
380 - Commerce, communications & transportation
2
581 - Specific topics in natural history
2
658 - General management
2
005 - Computer programming, programs & data
1
200 - Religion
1
520 - Astronomy & allied sciences
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
720 - Architecture
1
780 - Music
1