Classification
900 - History & geography
286
300 - Social sciences
124
624 - Civil engineering
92
930 - History of ancient world to ca. 499
68
933 - Palestine to 70
51
620 - Engineering & allied operations
50
700 - The arts; fine & decorative arts
38
600 - Technology
28
301 - Sociology & anthropology
27
333 - Economics of land & energy
25
363 - Other social problems & services
24
936 - Europe north & west of Italy to ca. 499
23
140 - Specific philosophical schools
17
720 - Architecture
17
320 - Political science
16
330 - Economics
16
939 - Other parts of ancient world to ca. 640
14
000 - Computer science, information & general works
13
551 - Geology, hydrology & meteorology
13
306 - Culture & institutions
12
550 - Earth sciences
12
621 - Applied physics
12
629 - Other branches of engineering
12
340 - Law
10
004 - Data processing & computer science
9
005 - Computer programming, programs & data
9
006 - Special computer methods
9
200 - Religion
9
500 - Natural sciences & mathematics
9
576 - Genetics & evolution
9
610 - Medicine & health
9
307 - Communities
8
380 - Commerce, communications & transportation
8
630 - Agriculture & related technologies
8
690 - Buildings
8
800 - Literature & rhetoric
8
304 - Factors affecting social behavior
7
560 - Paleontology; paleozoology
7
590 - Animals (Zoology)
7
617 - Surgery & related medical specialties
7
932 - Egypt to 640
7
942 - England & Wales
7
956 - Middle East (Near East)
7
001 - Knowledge
6
142 - Critical philosophy
6
305 - Social groups
6
910 - Geography & travel
6
972 - Middle America; Mexico
6
370 - Education
5
580 - Plants (Botany)
5
more ...