Classification
330 - Economics
352
320 - Political science
260
004 - Data processing & computer science
234
820 - English & Old English literatures
195
900 - History & geography
194
005 - Computer programming, programs & data
189
006 - Special computer methods
156
333 - Economics of land & energy
120
304 - Factors affecting social behavior
90
610 - Medicine & health
81
363 - Other social problems & services
79
551 - Geology, hydrology & meteorology
78
700 - The arts; fine & decorative arts
74
620 - Engineering & allied operations
64
370 - Education
60
300 - Social sciences
57
616 - Diseases
51
340 - Law
49
658 - General management
49
338 - Production
46
306 - Culture & institutions
40
938 - Greece to 323
37
000 - Computer science, information & general works
36
336 - Public finance
35
301 - Sociology & anthropology
34
930 - History of ancient world to ca. 499
34
970 - History of North America
34
380 - Commerce, communications & transportation
33
600 - Technology
32
800 - Literature & rhetoric
32
880 - Hellenic literatures; classical Greek
31
530 - Physics
30
621 - Applied physics
30
630 - Agriculture & related technologies
28
025 - Library operations
27
200 - Religion
27
550 - Earth sciences
26
500 - Natural sciences & mathematics
24
577 - Ecology
24
580 - Plants (Botany)
24
520 - Astronomy & allied sciences
23
100 - Philosophy & psychology
22
371 - Schools & their activities; special education
21
470 - Italic languages; Latin
21
332 - Financial economics
20
650 - Management & auxiliary services
19
920 - Biography, genealogy & insignia
19
510 - Mathematics
18
571 - Physiology & related subjects
18
003 - Systems
17
more ...