Classification
330 - Economics
1,893
320 - Political science
1,539
616 - Diseases
1,218
620 - Engineering & allied operations
916
621 - Applied physics
861
300 - Social sciences
772
551 - Geology, hydrology & meteorology
750
333 - Economics of land & energy
733
900 - History & geography
731
610 - Medicine & health
704
577 - Ecology
696
571 - Physiology & related subjects
651
501 - Philosophy & theory
563
530 - Physics
554
340 - Law
546
520 - Astronomy & allied sciences
501
001 - Knowledge
497
304 - Factors affecting social behavior
481
370 - Education
474
004 - Data processing & computer science
396
541 - Physical chemistry
395
820 - English & Old English literatures
384
580 - Plants (Botany)
380
142 - Critical philosophy
373
363 - Other social problems & services
339
523 - Specific celestial bodies & phenomena
321
301 - Sociology & anthropology
315
515 - Analysis
309
006 - Special computer methods
275
005 - Computer programming, programs & data
271
160 - Logic
257
306 - Culture & institutions
244
170 - Ethics
243
630 - Agriculture & related technologies
236
519 - Probabilities & applied mathematics
234
338 - Production
218
658 - General management
214
100 - Philosophy & psychology
207
660 - Chemical engineering
202
570 - Life sciences; biology
197
617 - Surgery & related medical specialties
196
572 - Biochemistry
192
910 - Geography & travel
187
531 - Classical mechanics; solid mechanics
186
634 - Orchards, fruits & forestry
183
576 - Genetics & evolution
176
410 - Linguistics
162
500 - Natural sciences & mathematics
159
624 - Civil engineering
159
371 - Schools & their activities; special education
156
more ...