Classification
330 - Economics
24,334
600 - Technology
8,326
620 - Engineering & allied operations
7,011
650 - Management & auxiliary services
4,746
610 - Medicine & health
4,127
300 - Social sciences
3,744
500 - Natural sciences & mathematics
3,668
900 - History & geography
2,953
000 - Computer science, information & general works
2,793
658 - General management
2,643
700 - The arts; fine & decorative arts
2,488
005 - Computer programming, programs & data
2,381
510 - Mathematics
2,044
333 - Economics of land & energy
1,891
616 - Diseases
1,832
301 - Sociology & anthropology
1,694
320 - Political science
1,542
331 - Labor economics
1,504
370 - Education
1,486
540 - Chemistry & allied sciences
1,311
363 - Other social problems & services
1,295
530 - Physics
1,244
004 - Data processing & computer science
1,242
006 - Special computer methods
1,131
340 - Law
1,107
332 - Financial economics
1,097
617 - Surgery & related medical specialties
1,060
380 - Commerce, communications & transportation
885
338 - Production
881
745 - Decorative arts
866
570 - Life sciences; biology
768
580 - Plants (Botany)
767
519 - Probabilities & applied mathematics
754
302 - Social interaction
742
384 - Communications; telecommunication
740
800 - Literature & rhetoric
676
150 - Psychology
634
100 - Philosophy & psychology
628
621 - Applied physics
624
140 - Specific philosophical schools
622
512 - Algebra
613
576 - Genetics & evolution
575
551 - Geology, hydrology & meteorology
561
306 - Culture & institutions
555
410 - Linguistics
455
305 - Social groups
432
572 - Biochemistry
404
400 - Language
391
612 - Human physiology
381
200 - Religion
378
more ...