Classification
500 - Natural sciences & mathematics
330 - Economics
16
300 - Social sciences
11
520 - Astronomy & allied sciences
10
658 - General management
10
302 - Social interaction
8
670 - Manufacturing
8
338 - Production
7
000 - Computer science, information & general works
6
332 - Financial economics
5
530 - Physics
4
620 - Engineering & allied operations
4
005 - Computer programming, programs & data
3
001 - Knowledge
2
100 - Philosophy & psychology
2
331 - Labor economics
2
510 - Mathematics
2
700 - The arts; fine & decorative arts
2
004 - Data processing & computer science
1
006 - Special computer methods
1
025 - Library operations
1
158 - Applied psychology
1
170 - Ethics
1
303 - Social processes
1
304 - Factors affecting social behavior
1
320 - Political science
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
368 - Insurance
1
370 - Education
1
381 - Commerce
1
519 - Probabilities & applied mathematics
1
537 - Electricity & electronics
1
538 - Magnetism
1
551 - Geology, hydrology & meteorology
1
571 - Physiology & related subjects
1
581 - Specific topics in natural history
1
600 - Technology
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
660 - Chemical engineering
1
796 - Athletic & outdoor sports & games
1
900 - History & geography
1