Classification
330 - Economics
495
620 - Engineering & allied operations
446
320 - Political science
351
900 - History & geography
234
700 - The arts; fine & decorative arts
211
610 - Medicine & health
203
616 - Diseases
180
600 - Technology
163
333 - Economics of land & energy
140
000 - Computer science, information & general works
116
540 - Chemistry & allied sciences
111
572 - Biochemistry
103
363 - Other social problems & services
100
530 - Physics
98
541 - Physical chemistry
93
300 - Social sciences
87
580 - Plants (Botany)
86
551 - Geology, hydrology & meteorology
78
571 - Physiology & related subjects
77
621 - Applied physics
77
340 - Law
68
658 - General management
64
500 - Natural sciences & mathematics
57
820 - English & Old English literatures
54
660 - Chemical engineering
53
546 - Inorganic chemistry
51
612 - Human physiology
46
380 - Commerce, communications & transportation
44
547 - Organic chemistry
44
577 - Ecology
43
579 - Microorganisms, fungi & algae
43
630 - Agriculture & related technologies
41
615 - Pharmacology & therapeutics
40
005 - Computer programming, programs & data
35
140 - Specific philosophical schools
34
613 - Personal health & safety
30
338 - Production
29
520 - Astronomy & allied sciences
29
576 - Genetics & evolution
28
930 - History of ancient world to ca. 499
28
549 - Mineralogy
27
670 - Manufacturing
27
304 - Factors affecting social behavior
26
001 - Knowledge
25
006 - Special computer methods
25
331 - Labor economics
25
332 - Financial economics
25
628 - Sanitary & municipal engineering
24
543 - Analytical chemistry
21
570 - Life sciences; biology
21
more ...