Classification
621 - Applied physics
1,729
006 - Special computer methods
1,398
620 - Engineering & allied operations
1,139
616 - Diseases
674
330 - Economics
530
304 - Factors affecting social behavior
515
629 - Other branches of engineering
487
005 - Computer programming, programs & data
443
658 - General management
432
004 - Data processing & computer science
402
610 - Medicine & health
358
306 - Culture & institutions
348
617 - Surgery & related medical specialties
323
571 - Physiology & related subjects
320
333 - Economics of land & energy
316
624 - Civil engineering
299
320 - Political science
295
660 - Chemical engineering
290
338 - Production
274
530 - Physics
273
670 - Manufacturing
264
363 - Other social problems & services
251
370 - Education
225
630 - Agriculture & related technologies
212
551 - Geology, hydrology & meteorology
198
579 - Microorganisms, fungi & algae
185
003 - Systems
180
615 - Pharmacology & therapeutics
178
519 - Probabilities & applied mathematics
166
515 - Analysis
148
690 - Buildings
145
612 - Human physiology
144
628 - Sanitary & municipal engineering
134
305 - Social groups
133
327 - International relations
130
340 - Law
130
541 - Physical chemistry
120
332 - Financial economics
119
307 - Communities
115
577 - Ecology
110
418 - Standard usage & applied linguistics
106
303 - Social processes
105
910 - Geography & travel
102
300 - Social sciences
97
371 - Schools & their activities; special education
94
570 - Life sciences; biology
93
613 - Personal health & safety
91
572 - Biochemistry
89
664 - Food technology
81
301 - Sociology & anthropology
73
more ...