Classification
900 - History & geography
320 - Political science
4,550
330 - Economics
4,292
600 - Technology
1,839
700 - The arts; fine & decorative arts
1,797
620 - Engineering & allied operations
1,723
300 - Social sciences
1,078
333 - Economics of land & energy
879
800 - Literature & rhetoric
825
576 - Genetics & evolution
571
363 - Other social problems & services
539
610 - Medicine & health
517
200 - Religion
514
340 - Law
494
000 - Computer science, information & general works
476
380 - Commerce, communications & transportation
467
100 - Philosophy & psychology
456
140 - Specific philosophical schools
453
301 - Sociology & anthropology
339
400 - Language
301
370 - Education
280
410 - Linguistics
231
580 - Plants (Botany)
212
720 - Architecture
191
630 - Agriculture & related technologies
151
780 - Music
150
551 - Geology, hydrology & meteorology
134
500 - Natural sciences & mathematics
127
297 - Islam, Babism & Bahai Faith
122
304 - Factors affecting social behavior
120
170 - Ethics
105
414 - Phonology & phonetics
103
581 - Specific topics in natural history
93
530 - Physics
92
540 - Chemistry & allied sciences
76
658 - General management
58
770 - Photography, photographs & computer art
54
296 - Judaism
53
791 - Public performances
50
361 - Social problems & social welfare in general
43
120 - Epistemology, causation & humankind
33
398 - Folklore
30
160 - Logic
22
612 - Human physiology
20
920 - Biography, genealogy & insignia
17
350 - Public administration & military science
15
364 - Criminology
13
550 - Earth sciences
12
520 - Astronomy & allied sciences
11
360 - Social problems & services; associations
10
more ...