Classification
330 - Economics
2,592
005 - Computer programming, programs & data
1,627
006 - Special computer methods
1,164
620 - Engineering & allied operations
1,016
658 - General management
907
610 - Medicine & health
879
616 - Diseases
861
621 - Applied physics
820
333 - Economics of land & energy
738
004 - Data processing & computer science
661
600 - Technology
616
500 - Natural sciences & mathematics
519
000 - Computer science, information & general works
497
320 - Political science
415
331 - Labor economics
385
363 - Other social problems & services
371
700 - The arts; fine & decorative arts
335
571 - Physiology & related subjects
302
580 - Plants (Botany)
270
900 - History & geography
269
338 - Production
264
660 - Chemical engineering
250
300 - Social sciences
248
630 - Agriculture & related technologies
221
340 - Law
218
572 - Biochemistry
216
519 - Probabilities & applied mathematics
202
577 - Ecology
198
617 - Surgery & related medical specialties
193
551 - Geology, hydrology & meteorology
183
615 - Pharmacology & therapeutics
179
745 - Decorative arts
176
380 - Commerce, communications & transportation
174
003 - Systems
162
612 - Human physiology
161
304 - Factors affecting social behavior
153
530 - Physics
144
302 - Social interaction
143
370 - Education
140
579 - Microorganisms, fungi & algae
139
670 - Manufacturing
135
570 - Life sciences; biology
131
541 - Physical chemistry
128
332 - Financial economics
127
540 - Chemistry & allied sciences
125
384 - Communications; telecommunication
122
664 - Food technology
116
629 - Other branches of engineering
114
001 - Knowledge
100
576 - Genetics & evolution
94
more ...