Classification
658 - General management
2,611
330 - Economics
1,903
547 - Organic chemistry
1,090
616 - Diseases
654
610 - Medicine & health
601
300 - Social sciences
526
620 - Engineering & allied operations
499
338 - Production
487
700 - The arts; fine & decorative arts
394
000 - Computer science, information & general works
384
333 - Economics of land & energy
350
600 - Technology
331
363 - Other social problems & services
317
540 - Chemistry & allied sciences
283
370 - Education
276
320 - Political science
267
371 - Schools & their activities; special education
252
302 - Social interaction
247
380 - Commerce, communications & transportation
230
580 - Plants (Botany)
222
004 - Data processing & computer science
215
541 - Physical chemistry
209
500 - Natural sciences & mathematics
183
900 - History & geography
171
670 - Manufacturing
166
327 - International relations
163
621 - Applied physics
159
005 - Computer programming, programs & data
154
140 - Specific philosophical schools
136
650 - Management & auxiliary services
135
570 - Life sciences; biology
130
630 - Agriculture & related technologies
129
306 - Culture & institutions
118
341 - Law of nations
112
612 - Human physiology
112
615 - Pharmacology & therapeutics
111
340 - Law
107
617 - Surgery & related medical specialties
107
384 - Communications; telecommunication
103
546 - Inorganic chemistry
101
660 - Chemical engineering
99
551 - Geology, hydrology & meteorology
98
572 - Biochemistry
98
664 - Food technology
98
576 - Genetics & evolution
93
571 - Physiology & related subjects
86
780 - Music
82
543 - Analytical chemistry
80
331 - Labor economics
75
629 - Other branches of engineering
74
more ...