Classification
900 - History & geography
1,060
930 - History of ancient world to ca. 499
492
300 - Social sciences
332
301 - Sociology & anthropology
165
700 - The arts; fine & decorative arts
153
200 - Religion
132
320 - Political science
122
363 - Other social problems & services
101
330 - Economics
81
140 - Specific philosophical schools
76
000 - Computer science, information & general works
72
800 - Literature & rhetoric
72
304 - Factors affecting social behavior
71
551 - Geology, hydrology & meteorology
71
333 - Economics of land & energy
56
100 - Philosophy & psychology
54
910 - Geography & travel
52
380 - Commerce, communications & transportation
49
720 - Architecture
48
340 - Law
44
620 - Engineering & allied operations
42
306 - Culture & institutions
39
933 - Palestine to 70
39
400 - Language
38
006 - Special computer methods
36
576 - Genetics & evolution
36
560 - Paleontology; paleozoology
34
600 - Technology
34
610 - Medicine & health
31
936 - Europe north & west of Italy to ca. 499
31
004 - Data processing & computer science
29
005 - Computer programming, programs & data
29
410 - Linguistics
29
297 - Islam, Babism & Bahai Faith
27
550 - Earth sciences
26
939 - Other parts of ancient world to ca. 640
23
370 - Education
22
520 - Astronomy & allied sciences
21
530 - Physics
21
630 - Agriculture & related technologies
21
305 - Social groups
20
540 - Chemistry & allied sciences
20
577 - Ecology
20
307 - Communities
19
780 - Music
19
500 - Natural sciences & mathematics
18
581 - Specific topics in natural history
17
519 - Probabilities & applied mathematics
16
791 - Public performances
14
621 - Applied physics
13
more ...