Classification
900 - History & geography
42
320 - Political science
35
330 - Economics
28
519 - Probabilities & applied mathematics
17
340 - Law
16
306 - Culture & institutions
15
327 - International relations
14
333 - Economics of land & energy
14
800 - Literature & rhetoric
13
301 - Sociology & anthropology
12
332 - Financial economics
12
616 - Diseases
12
809 - History, description & criticism
12
004 - Data processing & computer science
11
300 - Social sciences
11
304 - Factors affecting social behavior
11
331 - Labor economics
11
338 - Production
11
305 - Social groups
10
610 - Medicine & health
10
823 - English fiction
10
100 - Philosophy & psychology
9
363 - Other social problems & services
9
530 - Physics
9
664 - Food technology
9
302 - Social interaction
8
362 - Social welfare problems & services
8
140 - Specific philosophical schools
7
577 - Ecology
7
641 - Food & drink
7
576 - Genetics & evolution
6
621 - Applied physics
6
801 - Philosophy & theory
6
813 - American fiction in English
6
324 - The political process
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
006 - Special computer methods
4
303 - Social processes
4
342 - Constitutional & administrative law
4
355 - Military science
4
364 - Criminology
4
378 - Higher education
4
512 - Algebra
4
570 - Life sciences; biology
4
658 - General management
4
820 - English & Old English literatures
4
833 - German fiction
4
005 - Computer programming, programs & data
3
more ...