Classification
620 - Engineering & allied operations
600 - Technology
35
900 - History & geography
30
700 - The arts; fine & decorative arts
25
363 - Other social problems & services
17
330 - Economics
16
333 - Economics of land & energy
16
610 - Medicine & health
16
000 - Computer science, information & general works
14
140 - Specific philosophical schools
12
380 - Commerce, communications & transportation
10
500 - Natural sciences & mathematics
9
370 - Education
7
720 - Architecture
6
400 - Language
5
580 - Plants (Botany)
5
629 - Other branches of engineering
5
004 - Data processing & computer science
4
100 - Philosophy & psychology
4
300 - Social sciences
3
384 - Communications; telecommunication
3
576 - Genetics & evolution
3
612 - Human physiology
3
005 - Computer programming, programs & data
2
155 - Differential & developmental psychology
2
304 - Factors affecting social behavior
2
320 - Political science
2
331 - Labor economics
2
340 - Law
2
410 - Linguistics
2
551 - Geology, hydrology & meteorology
2
621 - Applied physics
2
630 - Agriculture & related technologies
2
658 - General management
2
158 - Applied psychology
1
301 - Sociology & anthropology
1
302 - Social interaction
1
303 - Social processes
1
332 - Financial economics
1
338 - Production
1
339 - Macroeconomics & related topics
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
650 - Management & auxiliary services
1
745 - Decorative arts
1
780 - Music
1
800 - Literature & rhetoric
1