Classification
006 - Special computer methods
2,628
005 - Computer programming, programs & data
2,359
004 - Data processing & computer science
1,935
621 - Applied physics
1,905
616 - Diseases
1,146
620 - Engineering & allied operations
980
658 - General management
949
519 - Probabilities & applied mathematics
782
629 - Other branches of engineering
779
530 - Physics
742
003 - Systems
673
610 - Medicine & health
578
515 - Analysis
519
571 - Physiology & related subjects
478
306 - Culture & institutions
457
304 - Factors affecting social behavior
446
617 - Surgery & related medical specialties
384
551 - Geology, hydrology & meteorology
361
333 - Economics of land & energy
358
320 - Political science
319
370 - Education
312
520 - Astronomy & allied sciences
290
570 - Life sciences; biology
286
518 - Numerical analysis
283
338 - Production
270
330 - Economics
267
612 - Human physiology
248
577 - Ecology
233
910 - Geography & travel
230
572 - Biochemistry
224
305 - Social groups
208
550 - Earth sciences
191
510 - Mathematics
178
363 - Other social problems & services
168
300 - Social sciences
158
670 - Manufacturing
155
301 - Sociology & anthropology
153
327 - International relations
150
614 - Incidence & prevention of disease
149
500 - Natural sciences & mathematics
148
660 - Chemical engineering
146
615 - Pharmacology & therapeutics
141
579 - Microorganisms, fungi & algae
133
613 - Personal health & safety
133
624 - Civil engineering
133
371 - Schools & their activities; special education
132
539 - Modern physics
124
630 - Agriculture & related technologies
123
523 - Specific celestial bodies & phenomena
120
580 - Plants (Botany)
113
more ...