Classification
900 - History & geography
1,987
930 - History of ancient world to ca. 499
497
300 - Social sciences
406
700 - The arts; fine & decorative arts
239
200 - Religion
201
320 - Political science
199
301 - Sociology & anthropology
189
140 - Specific philosophical schools
165
330 - Economics
119
800 - Literature & rhetoric
118
363 - Other social problems & services
112
000 - Computer science, information & general works
86
100 - Philosophy & psychology
86
720 - Architecture
79
304 - Factors affecting social behavior
78
551 - Geology, hydrology & meteorology
73
340 - Law
71
333 - Economics of land & energy
69
380 - Commerce, communications & transportation
68
620 - Engineering & allied operations
56
400 - Language
54
910 - Geography & travel
51
600 - Technology
50
500 - Natural sciences & mathematics
49
576 - Genetics & evolution
47
410 - Linguistics
46
610 - Medicine & health
42
306 - Culture & institutions
40
933 - Palestine to 70
40
370 - Education
34
560 - Paleontology; paleozoology
34
936 - Europe north & west of Italy to ca. 499
34
006 - Special computer methods
32
297 - Islam, Babism & Bahai Faith
31
004 - Data processing & computer science
28
005 - Computer programming, programs & data
28
540 - Chemistry & allied sciences
27
550 - Earth sciences
27
520 - Astronomy & allied sciences
26
939 - Other parts of ancient world to ca. 640
26
780 - Music
25
170 - Ethics
21
530 - Physics
21
590 - Animals (Zoology)
21
630 - Agriculture & related technologies
21
305 - Social groups
20
577 - Ecology
20
581 - Specific topics in natural history
20
307 - Communities
19
519 - Probabilities & applied mathematics
16
more ...