Classification
620 - Engineering & allied operations
730
600 - Technology
536
700 - The arts; fine & decorative arts
499
000 - Computer science, information & general works
375
333 - Economics of land & energy
326
900 - History & geography
326
330 - Economics
265
610 - Medicine & health
243
363 - Other social problems & services
190
580 - Plants (Botany)
178
540 - Chemistry & allied sciences
132
380 - Commerce, communications & transportation
110
808 - Rhetoric & collections of literature
90
414 - Phonology & phonetics
86
576 - Genetics & evolution
84
530 - Physics
76
140 - Specific philosophical schools
75
770 - Photography, photographs & computer art
71
340 - Law
65
500 - Natural sciences & mathematics
62
630 - Agriculture & related technologies
38
551 - Geology, hydrology & meteorology
36
420 - English & Old English
35
720 - Architecture
34
800 - Literature & rhetoric
34
470 - Italic languages; Latin
31
780 - Music
27
304 - Factors affecting social behavior
26
440 - Romance languages; French
26
781 - General principles & musical forms
25
658 - General management
24
320 - Political science
23
664 - Food technology
23
400 - Language
22
370 - Education
20
668 - Technology of other organic products
20
581 - Specific topics in natural history
19
615 - Pharmacology & therapeutics
19
384 - Communications; telecommunication
18
670 - Manufacturing
18
745 - Decorative arts
18
612 - Human physiology
17
621 - Applied physics
17
547 - Organic chemistry
16
531 - Classical mechanics; solid mechanics
15
100 - Philosophy & psychology
14
541 - Physical chemistry
14
660 - Chemical engineering
14
302 - Social interaction
13
410 - Linguistics
13
more ...