Classification
610 - Medicine & health
477
330 - Economics
443
900 - History & geography
391
320 - Political science
363
700 - The arts; fine & decorative arts
345
300 - Social sciences
269
658 - General management
265
333 - Economics of land & energy
262
005 - Computer programming, programs & data
231
363 - Other social problems & services
213
620 - Engineering & allied operations
211
100 - Philosophy & psychology
209
600 - Technology
195
006 - Special computer methods
184
370 - Education
182
200 - Religion
149
140 - Specific philosophical schools
143
340 - Law
137
304 - Factors affecting social behavior
131
380 - Commerce, communications & transportation
119
000 - Computer science, information & general works
114
800 - Literature & rhetoric
113
500 - Natural sciences & mathematics
108
301 - Sociology & anthropology
104
331 - Labor economics
85
400 - Language
81
338 - Production
75
530 - Physics
65
580 - Plants (Botany)
64
551 - Geology, hydrology & meteorology
60
621 - Applied physics
60
581 - Specific topics in natural history
58
612 - Human physiology
57
170 - Ethics
54
302 - Social interaction
54
004 - Data processing & computer science
51
410 - Linguistics
51
540 - Chemistry & allied sciences
51
630 - Agriculture & related technologies
49
720 - Architecture
44
306 - Culture & institutions
36
297 - Islam, Babism & Bahai Faith
35
361 - Social problems & social welfare in general
34
576 - Genetics & evolution
34
616 - Diseases
34
780 - Music
34
650 - Management & auxiliary services
33
364 - Criminology
30
384 - Communications; telecommunication
28
629 - Other branches of engineering
28
more ...