Classification
333 - Economics of land & energy
330 - Economics
94
600 - Technology
87
363 - Other social problems & services
77
700 - The arts; fine & decorative arts
73
320 - Political science
66
000 - Computer science, information & general works
63
610 - Medicine & health
59
620 - Engineering & allied operations
55
900 - History & geography
52
380 - Commerce, communications & transportation
44
370 - Education
27
140 - Specific philosophical schools
25
530 - Physics
21
580 - Plants (Botany)
19
304 - Factors affecting social behavior
18
500 - Natural sciences & mathematics
17
551 - Geology, hydrology & meteorology
15
100 - Philosophy & psychology
14
630 - Agriculture & related technologies
14
340 - Law
13
576 - Genetics & evolution
13
540 - Chemistry & allied sciences
12
581 - Specific topics in natural history
9
800 - Literature & rhetoric
9
300 - Social sciences
8
336 - Public finance
7
338 - Production
7
658 - General management
7
720 - Architecture
7
170 - Ethics
6
414 - Phonology & phonetics
6
612 - Human physiology
5
621 - Applied physics
5
400 - Language
4
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
398 - Folklore
1
520 - Astronomy & allied sciences
1
more ...