Classification
330 - Economics
1,929
320 - Political science
1,544
616 - Diseases
1,223
620 - Engineering & allied operations
922
621 - Applied physics
862
300 - Social sciences
780
551 - Geology, hydrology & meteorology
751
333 - Economics of land & energy
740
900 - History & geography
732
610 - Medicine & health
707
577 - Ecology
695
571 - Physiology & related subjects
656
501 - Philosophy & theory
563
530 - Physics
554
340 - Law
546
001 - Knowledge
502
520 - Astronomy & allied sciences
501
304 - Factors affecting social behavior
484
370 - Education
474
004 - Data processing & computer science
399
541 - Physical chemistry
395
820 - English & Old English literatures
384
580 - Plants (Botany)
381
142 - Critical philosophy
373
363 - Other social problems & services
340
523 - Specific celestial bodies & phenomena
321
301 - Sociology & anthropology
316
515 - Analysis
309
006 - Special computer methods
278
005 - Computer programming, programs & data
275
160 - Logic
258
306 - Culture & institutions
244
170 - Ethics
243
630 - Agriculture & related technologies
236
519 - Probabilities & applied mathematics
231
658 - General management
216
338 - Production
214
100 - Philosophy & psychology
207
660 - Chemical engineering
202
570 - Life sciences; biology
200
617 - Surgery & related medical specialties
196
572 - Biochemistry
192
910 - Geography & travel
188
634 - Orchards, fruits & forestry
183
531 - Classical mechanics; solid mechanics
179
576 - Genetics & evolution
176
410 - Linguistics
162
624 - Civil engineering
159
500 - Natural sciences & mathematics
158
371 - Schools & their activities; special education
157
more ...