Classification
004 - Data processing & computer science
798
005 - Computer programming, programs & data
469
000 - Computer science, information & general works
385
658 - General management
367
331 - Labor economics
305
006 - Special computer methods
237
500 - Natural sciences & mathematics
216
374 - Adult education
166
330 - Economics
103
620 - Engineering & allied operations
94
745 - Decorative arts
75
384 - Communications; telecommunication
56
600 - Technology
50
338 - Production
43
381 - Commerce
37
700 - The arts; fine & decorative arts
31
333 - Economics of land & energy
24
300 - Social sciences
23
363 - Other social problems & services
22
380 - Commerce, communications & transportation
18
621 - Applied physics
18
900 - History & geography
18
302 - Social interaction
17
770 - Photography, photographs & computer art
15
670 - Manufacturing
11
610 - Medicine & health
9
720 - Architecture
9
551 - Geology, hydrology & meteorology
7
140 - Specific philosophical schools
6
364 - Criminology
6
370 - Education
6
576 - Genetics & evolution
6
580 - Plants (Botany)
6
001 - Knowledge
5
400 - Language
5
510 - Mathematics
5
650 - Management & auxiliary services
5
025 - Library operations
4
340 - Law
4
158 - Applied psychology
3
343 - Military, tax, trade & industrial law
3
100 - Philosophy & psychology
2
304 - Factors affecting social behavior
2
305 - Social groups
2
320 - Political science
2
332 - Financial economics
2
368 - Insurance
2
519 - Probabilities & applied mathematics
2
572 - Biochemistry
2
629 - Other branches of engineering
2
more ...