Classification
330 - Economics
24,461
610 - Medicine & health
1,287
320 - Political science
1,214
500 - Natural sciences & mathematics
1,101
820 - English & Old English literatures
710
333 - Economics of land & energy
579
340 - Law
540
658 - General management
497
700 - The arts; fine & decorative arts
441
620 - Engineering & allied operations
438
900 - History & geography
401
000 - Computer science, information & general works
366
100 - Philosophy & psychology
358
070 - News media, journalism & publishing
339
600 - Technology
327
576 - Genetics & evolution
324
612 - Human physiology
304
005 - Computer programming, programs & data
294
580 - Plants (Botany)
289
616 - Diseases
280
300 - Social sciences
271
006 - Special computer methods
261
380 - Commerce, communications & transportation
252
363 - Other social problems & services
247
551 - Geology, hydrology & meteorology
243
302 - Social interaction
210
581 - Specific topics in natural history
206
004 - Data processing & computer science
171
519 - Probabilities & applied mathematics
163
370 - Education
160
304 - Factors affecting social behavior
159
140 - Specific philosophical schools
145
615 - Pharmacology & therapeutics
145
910 - Geography & travel
132
621 - Applied physics
129
338 - Production
127
306 - Culture & institutions
123
280 - Christian denominations & sects
107
530 - Physics
106
800 - Literature & rhetoric
105
331 - Labor economics
102
520 - Astronomy & allied sciences
97
540 - Chemistry & allied sciences
93
400 - Language
92
617 - Surgery & related medical specialties
91
571 - Physiology & related subjects
90
003 - Systems
88
332 - Financial economics
85
541 - Physical chemistry
77
650 - Management & auxiliary services
76
more ...