Classification
363 - Other social problems & services
330 - Economics
253
333 - Economics of land & energy
153
320 - Political science
81
380 - Commerce, communications & transportation
43
000 - Computer science, information & general works
35
600 - Technology
30
700 - The arts; fine & decorative arts
28
610 - Medicine & health
25
551 - Geology, hydrology & meteorology
19
630 - Agriculture & related technologies
19
140 - Specific philosophical schools
17
304 - Factors affecting social behavior
13
370 - Education
13
580 - Plants (Botany)
12
620 - Engineering & allied operations
11
900 - History & geography
10
340 - Law
9
658 - General management
9
336 - Public finance
7
581 - Specific topics in natural history
7
500 - Natural sciences & mathematics
6
576 - Genetics & evolution
6
800 - Literature & rhetoric
5
720 - Architecture
4
410 - Linguistics
3
100 - Philosophy & psychology
2
297 - Islam, Babism & Bahai Faith
2
300 - Social sciences
2
361 - Social problems & social welfare in general
2
657 - Accounting
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
350 - Public administration & military science
1
400 - Language
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1