Classification
005 - Computer programming, programs & data
16
004 - Data processing & computer science
14
006 - Special computer methods
13
658 - General management
13
330 - Economics
9
620 - Engineering & allied operations
9
320 - Political science
7
900 - History & geography
6
300 - Social sciences
5
621 - Applied physics
5
003 - Systems
4
304 - Factors affecting social behavior
4
400 - Language
4
670 - Manufacturing
4
340 - Law
3
510 - Mathematics
3
511 - General principles of mathematics
3
519 - Probabilities & applied mathematics
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
303 - Social processes
2
306 - Culture & institutions
2
333 - Economics of land & energy
2
515 - Analysis
2
520 - Astronomy & allied sciences
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
025 - Library operations
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
200 - Religion
1
301 - Sociology & anthropology
1
302 - Social interaction
1
331 - Labor economics
1
341 - Law of nations
1
363 - Other social problems & services
1
370 - Education
1
371 - Schools & their activities; special education
1
378 - Higher education
1
381 - Commerce
1
401 - Philosophy & theory
1
410 - Linguistics
1
414 - Phonology & phonetics
1
501 - Philosophy & theory
1
512 - Algebra
1
514 - Topology
1
530 - Physics
1
571 - Physiology & related subjects
1
577 - Ecology
1
more ...