Classification
330 - Economics
600 - Technology
333 - Economics of land & energy
476
620 - Engineering & allied operations
397
700 - The arts; fine & decorative arts
382
320 - Political science
335
363 - Other social problems & services
316
900 - History & geography
287
000 - Computer science, information & general works
247
610 - Medicine & health
202
380 - Commerce, communications & transportation
167
370 - Education
137
630 - Agriculture & related technologies
128
140 - Specific philosophical schools
97
580 - Plants (Botany)
96
658 - General management
95
304 - Factors affecting social behavior
89
551 - Geology, hydrology & meteorology
76
300 - Social sciences
69
576 - Genetics & evolution
62
500 - Natural sciences & mathematics
53
581 - Specific topics in natural history
44
720 - Architecture
41
340 - Law
40
540 - Chemistry & allied sciences
35
100 - Philosophy & psychology
32
800 - Literature & rhetoric
31
400 - Language
27
170 - Ethics
22
657 - Accounting
17
780 - Music
17
301 - Sociology & anthropology
15
200 - Religion
13
338 - Production
13
414 - Phonology & phonetics
13
530 - Physics
13
336 - Public finance
12
410 - Linguistics
11
005 - Computer programming, programs & data
9
350 - Public administration & military science
9
361 - Social problems & social welfare in general
8
651 - Office services
7
650 - Management & auxiliary services
6
160 - Logic
5
331 - Labor economics
5
615 - Pharmacology & therapeutics
5
770 - Photography, photographs & computer art
5
297 - Islam, Babism & Bahai Faith
4
302 - Social interaction
4
332 - Financial economics
4
more ...