Classification
600 - Technology
1,686
006 - Special computer methods
1,286
500 - Natural sciences & mathematics
1,276
330 - Economics
1,212
620 - Engineering & allied operations
937
370 - Education
791
621 - Applied physics
775
658 - General management
737
005 - Computer programming, programs & data
680
004 - Data processing & computer science
615
610 - Medicine & health
612
700 - The arts; fine & decorative arts
606
000 - Computer science, information & general works
590
900 - History & geography
578
333 - Economics of land & energy
512
300 - Social sciences
477
320 - Political science
471
820 - English & Old English literatures
458
551 - Geology, hydrology & meteorology
453
363 - Other social problems & services
402
616 - Diseases
322
910 - Geography & travel
320
629 - Other branches of engineering
262
530 - Physics
253
302 - Social interaction
246
331 - Labor economics
238
571 - Physiology & related subjects
231
380 - Commerce, communications & transportation
229
100 - Philosophy & psychology
223
304 - Factors affecting social behavior
218
140 - Specific philosophical schools
216
612 - Human physiology
207
338 - Production
195
515 - Analysis
193
340 - Law
191
519 - Probabilities & applied mathematics
189
306 - Culture & institutions
185
580 - Plants (Botany)
178
630 - Agriculture & related technologies
156
301 - Sociology & anthropology
150
577 - Ecology
149
003 - Systems
141
670 - Manufacturing
138
650 - Management & auxiliary services
136
800 - Literature & rhetoric
129
550 - Earth sciences
124
570 - Life sciences; biology
122
001 - Knowledge
120
510 - Mathematics
119
158 - Applied psychology
118
more ...