Classification
620 - Engineering & allied operations
447
330 - Economics
446
658 - General management
437
300 - Social sciences
309
340 - Law
268
320 - Political science
242
650 - Management & auxiliary services
240
900 - History & geography
180
610 - Medicine & health
179
600 - Technology
169
700 - The arts; fine & decorative arts
146
616 - Diseases
123
621 - Applied physics
119
005 - Computer programming, programs & data
109
004 - Data processing & computer science
95
333 - Economics of land & energy
91
301 - Sociology & anthropology
82
670 - Manufacturing
78
000 - Computer science, information & general works
73
820 - English & Old English literatures
69
302 - Social interaction
67
500 - Natural sciences & mathematics
67
006 - Special computer methods
65
150 - Psychology
63
370 - Education
63
306 - Culture & institutions
61
530 - Physics
60
617 - Surgery & related medical specialties
57
332 - Financial economics
47
780 - Music
47
001 - Knowledge
46
158 - Applied psychology
42
100 - Philosophy & psychology
36
305 - Social groups
34
380 - Commerce, communications & transportation
33
510 - Mathematics
33
338 - Production
31
540 - Chemistry & allied sciences
30
363 - Other social problems & services
29
570 - Life sciences; biology
29
304 - Factors affecting social behavior
28
414 - Phonology & phonetics
28
200 - Religion
27
331 - Labor economics
27
580 - Plants (Botany)
27
629 - Other branches of engineering
27
667 - Cleaning, color & coating technologies
26
770 - Photography, photographs & computer art
24
381 - Commerce
23
519 - Probabilities & applied mathematics
23
more ...