Classification
620 - Engineering & allied operations
600 - Technology
2,832
500 - Natural sciences & mathematics
2,480
900 - History & geography
1,857
005 - Computer programming, programs & data
1,803
700 - The arts; fine & decorative arts
1,210
621 - Applied physics
1,136
658 - General management
1,065
333 - Economics of land & energy
1,050
000 - Computer science, information & general works
985
384 - Communications; telecommunication
931
330 - Economics
850
331 - Labor economics
831
363 - Other social problems & services
756
745 - Decorative arts
739
380 - Commerce, communications & transportation
503
610 - Medicine & health
461
004 - Data processing & computer science
354
630 - Agriculture & related technologies
338
006 - Special computer methods
327
580 - Plants (Botany)
323
140 - Specific philosophical schools
253
629 - Other branches of engineering
210
576 - Genetics & evolution
200
302 - Social interaction
195
540 - Chemistry & allied sciences
190
300 - Social sciences
184
338 - Production
161
551 - Geology, hydrology & meteorology
160
720 - Architecture
159
530 - Physics
158
510 - Mathematics
157
320 - Political science
150
374 - Adult education
149
770 - Photography, photographs & computer art
139
370 - Education
113
340 - Law
110
670 - Manufacturing
96
414 - Phonology & phonetics
93
581 - Specific topics in natural history
76
800 - Literature & rhetoric
76
781 - General principles & musical forms
69
100 - Philosophy & psychology
66
660 - Chemical engineering
66
400 - Language
65
381 - Commerce
63
681 - Precision instruments & other devices
51
304 - Factors affecting social behavior
50
519 - Probabilities & applied mathematics
44
001 - Knowledge
43
more ...