Classification
600 - Technology
45,513
330 - Economics
21,371
610 - Medicine & health
5,490
320 - Political science
4,248
700 - The arts; fine & decorative arts
3,776
333 - Economics of land & energy
3,713
620 - Engineering & allied operations
3,442
000 - Computer science, information & general works
3,132
900 - History & geography
3,095
658 - General management
2,930
363 - Other social problems & services
2,121
370 - Education
2,071
340 - Law
1,905
300 - Social sciences
1,730
380 - Commerce, communications & transportation
1,362
338 - Production
1,182
140 - Specific philosophical schools
1,158
580 - Plants (Botany)
1,096
304 - Factors affecting social behavior
1,067
006 - Special computer methods
1,042
530 - Physics
986
306 - Culture & institutions
970
621 - Applied physics
939
616 - Diseases
904
500 - Natural sciences & mathematics
902
540 - Chemistry & allied sciences
879
332 - Financial economics
854
005 - Computer programming, programs & data
824
551 - Geology, hydrology & meteorology
819
004 - Data processing & computer science
810
301 - Sociology & anthropology
713
576 - Genetics & evolution
638
519 - Probabilities & applied mathematics
605
302 - Social interaction
602
630 - Agriculture & related technologies
553
820 - English & Old English literatures
544
650 - Management & auxiliary services
510
100 - Philosophy & psychology
482
510 - Mathematics
464
670 - Manufacturing
436
305 - Social groups
426
001 - Knowledge
419
331 - Labor economics
416
327 - International relations
394
629 - Other branches of engineering
394
200 - Religion
381
800 - Literature & rhetoric
359
361 - Social problems & social welfare in general
354
612 - Human physiology
320
371 - Schools & their activities; special education
311
more ...