Classification
380 - Commerce, communications & transportation
000 - Computer science, information & general works
362
600 - Technology
337
700 - The arts; fine & decorative arts
307
330 - Economics
278
333 - Economics of land & energy
268
900 - History & geography
234
620 - Engineering & allied operations
222
363 - Other social problems & services
161
384 - Communications; telecommunication
122
658 - General management
115
610 - Medicine & health
113
500 - Natural sciences & mathematics
110
140 - Specific philosophical schools
99
320 - Political science
87
580 - Plants (Botany)
87
576 - Genetics & evolution
73
551 - Geology, hydrology & meteorology
71
300 - Social sciences
66
340 - Law
63
370 - Education
57
540 - Chemistry & allied sciences
44
530 - Physics
43
630 - Agriculture & related technologies
43
302 - Social interaction
40
400 - Language
40
800 - Literature & rhetoric
40
414 - Phonology & phonetics
36
581 - Specific topics in natural history
28
720 - Architecture
28
304 - Factors affecting social behavior
24
410 - Linguistics
23
612 - Human physiology
23
100 - Philosophy & psychology
22
651 - Office services
22
808 - Rhetoric & collections of literature
22
650 - Management & auxiliary services
16
331 - Labor economics
15
381 - Commerce
15
200 - Religion
11
301 - Sociology & anthropology
10
158 - Applied psychology
8
361 - Social problems & social welfare in general
8
615 - Pharmacology & therapeutics
8
780 - Music
8
303 - Social processes
7
338 - Production
7
657 - Accounting
7
004 - Data processing & computer science
6
006 - Special computer methods
6
more ...