Classification
500 - Natural sciences & mathematics
600 - Technology
13,130
005 - Computer programming, programs & data
2,589
658 - General management
2,579
620 - Engineering & allied operations
2,511
330 - Economics
2,230
300 - Social sciences
1,646
302 - Social interaction
1,555
331 - Labor economics
1,431
670 - Manufacturing
1,408
004 - Data processing & computer science
1,122
000 - Computer science, information & general works
1,007
384 - Communications; telecommunication
985
006 - Special computer methods
774
745 - Decorative arts
509
520 - Astronomy & allied sciences
494
338 - Production
460
700 - The arts; fine & decorative arts
391
381 - Commerce
313
333 - Economics of land & energy
303
610 - Medicine & health
296
363 - Other social problems & services
284
510 - Mathematics
237
100 - Philosophy & psychology
226
320 - Political science
216
900 - History & geography
202
380 - Commerce, communications & transportation
200
576 - Genetics & evolution
191
153 - Mental processes & intelligence
187
370 - Education
174
374 - Adult education
165
530 - Physics
165
519 - Probabilities & applied mathematics
162
580 - Plants (Botany)
157
650 - Management & auxiliary services
153
158 - Applied psychology
148
621 - Applied physics
148
581 - Specific topics in natural history
146
612 - Human physiology
132
303 - Social processes
119
551 - Geology, hydrology & meteorology
115
140 - Specific philosophical schools
108
332 - Financial economics
108
364 - Criminology
99
001 - Knowledge
97
400 - Language
88
540 - Chemistry & allied sciences
86
025 - Library operations
81
615 - Pharmacology & therapeutics
72
340 - Law
59
more ...