Classification
005 - Computer programming, programs & data
7,183
004 - Data processing & computer science
5,636
000 - Computer science, information & general works
4,313
658 - General management
4,266
006 - Special computer methods
3,801
330 - Economics
2,494
500 - Natural sciences & mathematics
1,851
700 - The arts; fine & decorative arts
1,405
621 - Applied physics
1,222
600 - Technology
1,054
333 - Economics of land & energy
997
331 - Labor economics
977
620 - Engineering & allied operations
973
610 - Medicine & health
872
003 - Systems
713
363 - Other social problems & services
704
025 - Library operations
695
384 - Communications; telecommunication
642
650 - Management & auxiliary services
617
910 - Geography & travel
593
380 - Commerce, communications & transportation
583
338 - Production
561
300 - Social sciences
468
580 - Plants (Botany)
445
530 - Physics
442
900 - History & geography
407
551 - Geology, hydrology & meteorology
406
140 - Specific philosophical schools
405
302 - Social interaction
377
540 - Chemistry & allied sciences
375
320 - Political science
355
576 - Genetics & evolution
322
303 - Social processes
297
670 - Manufacturing
284
745 - Decorative arts
257
381 - Commerce
247
630 - Agriculture & related technologies
239
340 - Law
235
370 - Education
217
001 - Knowledge
207
519 - Probabilities & applied mathematics
188
343 - Military, tax, trade & industrial law
175
371 - Schools & their activities; special education
163
518 - Numerical analysis
160
400 - Language
150
304 - Factors affecting social behavior
149
581 - Specific topics in natural history
140
720 - Architecture
135
374 - Adult education
131
100 - Philosophy & psychology
130
more ...