Classification
330 - Economics
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
333 - Economics of land & energy
90
600 - Technology
74
900 - History & geography
60
000 - Computer science, information & general works
59
363 - Other social problems & services
59
620 - Engineering & allied operations
47
320 - Political science
41
140 - Specific philosophical schools
35
610 - Medicine & health
33
551 - Geology, hydrology & meteorology
25
370 - Education
24
658 - General management
18
340 - Law
16
576 - Genetics & evolution
16
720 - Architecture
15
630 - Agriculture & related technologies
12
300 - Social sciences
11
304 - Factors affecting social behavior
11
400 - Language
11
800 - Literature & rhetoric
11
500 - Natural sciences & mathematics
10
580 - Plants (Botany)
10
581 - Specific topics in natural history
8
414 - Phonology & phonetics
6
530 - Physics
6
100 - Philosophy & psychology
4
200 - Religion
4
301 - Sociology & anthropology
4
410 - Linguistics
4
540 - Chemistry & allied sciences
4
657 - Accounting
4
780 - Music
4
170 - Ethics
3
297 - Islam, Babism & Bahai Faith
2
361 - Social problems & social welfare in general
2
791 - Public performances
2
160 - Logic
1
336 - Public finance
1
350 - Public administration & military science
1
550 - Earth sciences
1
612 - Human physiology
1
650 - Management & auxiliary services
1
770 - Photography, photographs & computer art
1