Classification
000 - Computer science, information & general works
500 - Natural sciences & mathematics
186
745 - Decorative arts
140
331 - Labor economics
122
658 - General management
98
620 - Engineering & allied operations
59
600 - Technology
38
330 - Economics
28
380 - Commerce, communications & transportation
24
333 - Economics of land & energy
21
700 - The arts; fine & decorative arts
20
519 - Probabilities & applied mathematics
18
384 - Communications; telecommunication
12
363 - Other social problems & services
11
140 - Specific philosophical schools
10
320 - Political science
9
374 - Adult education
9
381 - Commerce
9
610 - Medicine & health
9
621 - Applied physics
9
370 - Education
8
302 - Social interaction
7
006 - Special computer methods
6
300 - Social sciences
6
770 - Photography, photographs & computer art
6
100 - Philosophy & psychology
5
332 - Financial economics
5
510 - Mathematics
5
900 - History & geography
5
338 - Production
4
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
153 - Mental processes & intelligence
3
170 - Ethics
3
304 - Factors affecting social behavior
3
340 - Law
3
414 - Phonology & phonetics
3
530 - Physics
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
720 - Architecture
3
790 - Recreational & performing arts
3
001 - Knowledge
2
011 - Bibliographies
2
200 - Religion
2
361 - Social problems & social welfare in general
2
629 - Other branches of engineering
2
781 - General principles & musical forms
2
791 - Public performances
2
more ...