Classification
500 - Natural sciences & mathematics
004 - Data processing & computer science
668
331 - Labor economics
184
658 - General management
133
384 - Communications; telecommunication
81
745 - Decorative arts
58
330 - Economics
48
620 - Engineering & allied operations
40
374 - Adult education
28
005 - Computer programming, programs & data
26
338 - Production
24
510 - Mathematics
13
300 - Social sciences
11
370 - Education
10
302 - Social interaction
9
381 - Commerce
9
380 - Commerce, communications & transportation
7
600 - Technology
5
670 - Manufacturing
5
140 - Specific philosophical schools
4
621 - Applied physics
4
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
006 - Special computer methods
3
025 - Library operations
3
332 - Financial economics
3
333 - Economics of land & energy
3
400 - Language
3
808 - Rhetoric & collections of literature
3
001 - Knowledge
2
028 - Reading & use of other information media
2
610 - Medicine & health
2
650 - Management & auxiliary services
2
794 - Indoor games of skill
2
800 - Literature & rhetoric
2
900 - History & geography
2
020 - Library & information sciences
1
100 - Philosophy & psychology
1
153 - Mental processes & intelligence
1
158 - Applied psychology
1
303 - Social processes
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
371 - Schools & their activities; special education
1
372 - Elementary education
1
410 - Linguistics
1
519 - Probabilities & applied mathematics
1
551 - Geology, hydrology & meteorology
1
720 - Architecture
1
more ...