Classification
000 - Computer science, information & general works
700 - The arts; fine & decorative arts
333 - Economics of land & energy
490
600 - Technology
476
610 - Medicine & health
351
363 - Other social problems & services
307
620 - Engineering & allied operations
277
330 - Economics
274
380 - Commerce, communications & transportation
239
900 - History & geography
234
140 - Specific philosophical schools
209
580 - Plants (Botany)
196
576 - Genetics & evolution
169
540 - Chemistry & allied sciences
168
500 - Natural sciences & mathematics
153
320 - Political science
132
551 - Geology, hydrology & meteorology
120
530 - Physics
117
630 - Agriculture & related technologies
89
370 - Education
79
720 - Architecture
75
658 - General management
71
400 - Language
67
340 - Law
64
581 - Specific topics in natural history
64
414 - Phonology & phonetics
63
800 - Literature & rhetoric
54
304 - Factors affecting social behavior
36
100 - Philosophy & psychology
35
612 - Human physiology
31
410 - Linguistics
29
300 - Social sciences
19
361 - Social problems & social welfare in general
15
170 - Ethics
14
200 - Religion
14
615 - Pharmacology & therapeutics
13
780 - Music
13
301 - Sociology & anthropology
12
550 - Earth sciences
7
657 - Accounting
7
520 - Astronomy & allied sciences
6
770 - Photography, photographs & computer art
6
791 - Public performances
6
120 - Epistemology, causation & humankind
4
297 - Islam, Babism & Bahai Faith
4
590 - Animals (Zoology)
4
160 - Logic
3
650 - Management & auxiliary services
3
350 - Public administration & military science
2
153 - Mental processes & intelligence
1
more ...