Classification
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
347
620 - Engineering & allied operations
308
900 - History & geography
232
333 - Economics of land & energy
216
330 - Economics
196
000 - Computer science, information & general works
193
363 - Other social problems & services
191
304 - Factors affecting social behavior
135
140 - Specific philosophical schools
130
580 - Plants (Botany)
111
320 - Political science
92
380 - Commerce, communications & transportation
89
370 - Education
87
630 - Agriculture & related technologies
83
300 - Social sciences
49
500 - Natural sciences & mathematics
41
576 - Genetics & evolution
41
170 - Ethics
38
551 - Geology, hydrology & meteorology
38
100 - Philosophy & psychology
36
340 - Law
32
540 - Chemistry & allied sciences
31
658 - General management
29
720 - Architecture
29
581 - Specific topics in natural history
22
615 - Pharmacology & therapeutics
22
400 - Language
21
414 - Phonology & phonetics
20
612 - Human physiology
19
530 - Physics
17
800 - Literature & rhetoric
17
361 - Social problems & social welfare in general
10
410 - Linguistics
9
200 - Religion
8
301 - Sociology & anthropology
7
780 - Music
6
360 - Social problems & services; associations
4
657 - Accounting
4
350 - Public administration & military science
3
364 - Criminology
3
120 - Epistemology, causation & humankind
2
336 - Public finance
2
791 - Public performances
2
001 - Knowledge
1
297 - Islam, Babism & Bahai Faith
1
338 - Production
1
362 - Social welfare problems & services
1
520 - Astronomy & allied sciences
1
more ...