Classification
600 - Technology
1,597
900 - History & geography
735
610 - Medicine & health
567
320 - Political science
538
330 - Economics
527
700 - The arts; fine & decorative arts
511
100 - Philosophy & psychology
453
300 - Social sciences
453
333 - Economics of land & energy
320
370 - Education
316
658 - General management
294
363 - Other social problems & services
269
340 - Law
258
200 - Religion
254
005 - Computer programming, programs & data
242
620 - Engineering & allied operations
236
140 - Specific philosophical schools
223
800 - Literature & rhetoric
221
304 - Factors affecting social behavior
218
006 - Special computer methods
199
400 - Language
167
301 - Sociology & anthropology
163
380 - Commerce, communications & transportation
151
000 - Computer science, information & general works
149
500 - Natural sciences & mathematics
145
621 - Applied physics
116
170 - Ethics
111
530 - Physics
101
410 - Linguistics
99
331 - Labor economics
92
338 - Production
82
551 - Geology, hydrology & meteorology
69
580 - Plants (Botany)
67
581 - Specific topics in natural history
67
540 - Chemistry & allied sciences
66
720 - Architecture
65
630 - Agriculture & related technologies
61
302 - Social interaction
59
780 - Music
58
004 - Data processing & computer science
57
612 - Human physiology
57
306 - Culture & institutions
50
361 - Social problems & social welfare in general
49
297 - Islam, Babism & Bahai Faith
46
616 - Diseases
45
576 - Genetics & evolution
43
305 - Social groups
41
120 - Epistemology, causation & humankind
37
364 - Criminology
37
791 - Public performances
37
more ...