Classification
333 - Economics of land & energy
330 - Economics
103
600 - Technology
91
363 - Other social problems & services
84
700 - The arts; fine & decorative arts
75
320 - Political science
73
000 - Computer science, information & general works
64
610 - Medicine & health
60
620 - Engineering & allied operations
57
900 - History & geography
54
380 - Commerce, communications & transportation
46
530 - Physics
45
370 - Education
31
140 - Specific philosophical schools
26
580 - Plants (Botany)
20
630 - Agriculture & related technologies
19
304 - Factors affecting social behavior
18
500 - Natural sciences & mathematics
17
551 - Geology, hydrology & meteorology
17
100 - Philosophy & psychology
15
340 - Law
14
540 - Chemistry & allied sciences
13
576 - Genetics & evolution
13
581 - Specific topics in natural history
13
300 - Social sciences
11
800 - Literature & rhetoric
9
720 - Architecture
8
336 - Public finance
7
338 - Production
7
658 - General management
7
170 - Ethics
6
400 - Language
6
414 - Phonology & phonetics
6
612 - Human physiology
5
621 - Applied physics
5
410 - Linguistics
4
120 - Epistemology, causation & humankind
2
200 - Religion
2
301 - Sociology & anthropology
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
381 - Commerce
2
550 - Earth sciences
2
615 - Pharmacology & therapeutics
2
158 - Applied psychology
1
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
303 - Social processes
1
398 - Folklore
1
more ...