Classification
900 - History & geography
389
330 - Economics
342
700 - The arts; fine & decorative arts
328
320 - Political science
305
300 - Social sciences
269
610 - Medicine & health
267
658 - General management
265
005 - Computer programming, programs & data
231
620 - Engineering & allied operations
208
333 - Economics of land & energy
201
100 - Philosophy & psychology
194
006 - Special computer methods
184
363 - Other social problems & services
165
600 - Technology
163
200 - Religion
149
140 - Specific philosophical schools
142
370 - Education
141
340 - Law
137
800 - Literature & rhetoric
113
000 - Computer science, information & general works
111
500 - Natural sciences & mathematics
107
380 - Commerce, communications & transportation
105
301 - Sociology & anthropology
104
331 - Labor economics
85
400 - Language
81
338 - Production
75
304 - Factors affecting social behavior
68
530 - Physics
65
580 - Plants (Botany)
62
551 - Geology, hydrology & meteorology
60
621 - Applied physics
60
581 - Specific topics in natural history
58
612 - Human physiology
56
302 - Social interaction
53
170 - Ethics
52
004 - Data processing & computer science
51
410 - Linguistics
50
540 - Chemistry & allied sciences
50
630 - Agriculture & related technologies
44
720 - Architecture
44
306 - Culture & institutions
36
297 - Islam, Babism & Bahai Faith
35
576 - Genetics & evolution
34
616 - Diseases
34
780 - Music
34
361 - Social problems & social welfare in general
33
650 - Management & auxiliary services
33
364 - Criminology
30
384 - Communications; telecommunication
28
629 - Other branches of engineering
28
more ...