Classification
330 - Economics
6,416
005 - Computer programming, programs & data
3,279
616 - Diseases
2,562
006 - Special computer methods
2,400
610 - Medicine & health
2,218
658 - General management
1,887
004 - Data processing & computer science
1,811
820 - English & Old English literatures
1,685
320 - Political science
1,525
620 - Engineering & allied operations
1,370
000 - Computer science, information & general works
1,230
621 - Applied physics
1,077
340 - Law
954
617 - Surgery & related medical specialties
930
500 - Natural sciences & mathematics
836
300 - Social sciences
817
900 - History & geography
795
331 - Labor economics
783
333 - Economics of land & energy
778
700 - The arts; fine & decorative arts
635
530 - Physics
560
571 - Physiology & related subjects
525
338 - Production
509
600 - Technology
494
519 - Probabilities & applied mathematics
492
363 - Other social problems & services
489
370 - Education
466
302 - Social interaction
428
745 - Decorative arts
427
515 - Analysis
416
612 - Human physiology
381
629 - Other branches of engineering
370
650 - Management & auxiliary services
367
332 - Financial economics
348
304 - Factors affecting social behavior
336
380 - Commerce, communications & transportation
317
551 - Geology, hydrology & meteorology
305
336 - Public finance
300
572 - Biochemistry
294
670 - Manufacturing
286
003 - Systems
285
381 - Commerce
261
580 - Plants (Botany)
247
615 - Pharmacology & therapeutics
242
384 - Communications; telecommunication
239
577 - Ecology
237
301 - Sociology & anthropology
231
520 - Astronomy & allied sciences
228
800 - Literature & rhetoric
228
100 - Philosophy & psychology
221
more ...