Classification
330 - Economics
80
900 - History & geography
49
930 - History of ancient world to ca. 499
43
320 - Political science
40
820 - English & Old English literatures
37
700 - The arts; fine & decorative arts
25
800 - Literature & rhetoric
25
896 - African literatures
23
333 - Economics of land & energy
22
551 - Geology, hydrology & meteorology
17
610 - Medicine & health
17
300 - Social sciences
16
620 - Engineering & allied operations
15
000 - Computer science, information & general works
13
200 - Religion
13
290 - Other religions
13
363 - Other social problems & services
13
520 - Astronomy & allied sciences
13
301 - Sociology & anthropology
12
577 - Ecology
12
304 - Factors affecting social behavior
11
410 - Linguistics
10
500 - Natural sciences & mathematics
10
580 - Plants (Botany)
10
616 - Diseases
10
006 - Special computer methods
9
306 - Culture & institutions
9
338 - Production
9
510 - Mathematics
9
004 - Data processing & computer science
8
140 - Specific philosophical schools
8
305 - Social groups
8
340 - Law
8
380 - Commerce, communications & transportation
8
576 - Genetics & evolution
8
600 - Technology
8
621 - Applied physics
8
230 - Christianity & Christian theology
7
302 - Social interaction
7
400 - Language
7
490 - Other languages
7
630 - Agriculture & related technologies
7
297 - Islam, Babism & Bahai Faith
6
327 - International relations
6
370 - Education
6
512 - Algebra
6
581 - Specific topics in natural history
6
658 - General management
6
909 - World history
6
962 - Egypt & Sudan
6
more ...