Classification
005 - Computer programming, programs & data
606
658 - General management
261
006 - Special computer methods
246
330 - Economics
236
500 - Natural sciences & mathematics
156
000 - Computer science, information & general works
154
004 - Data processing & computer science
154
410 - Linguistics
154
401 - Philosophy & theory
110
616 - Diseases
106
620 - Engineering & allied operations
102
331 - Labor economics
98
320 - Political science
95
300 - Social sciences
93
400 - Language
81
100 - Philosophy & psychology
77
370 - Education
74
302 - Social interaction
68
900 - History & geography
68
610 - Medicine & health
67
338 - Production
66
306 - Culture & institutions
62
501 - Philosophy & theory
58
621 - Applied physics
53
333 - Economics of land & energy
51
340 - Law
47
418 - Standard usage & applied linguistics
46
700 - The arts; fine & decorative arts
44
670 - Manufacturing
42
745 - Decorative arts
40
170 - Ethics
38
380 - Commerce, communications & transportation
38
160 - Logic
32
153 - Mental processes & intelligence
30
301 - Sociology & anthropology
29
363 - Other social problems & services
29
381 - Commerce
29
650 - Management & auxiliary services
27
304 - Factors affecting social behavior
26
200 - Religion
24
617 - Surgery & related medical specialties
24
149 - Other philosophical systems
23
140 - Specific philosophical schools
22
414 - Phonology & phonetics
22
510 - Mathematics
22
384 - Communications; telecommunication
21
600 - Technology
21
303 - Social processes
20
003 - Systems
19
327 - International relations
19
more ...