Classification
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
34
000 - Computer science, information & general works
26
363 - Other social problems & services
26
330 - Economics
23
600 - Technology
23
620 - Engineering & allied operations
19
610 - Medicine & health
16
900 - History & geography
15
380 - Commerce, communications & transportation
13
320 - Political science
11
580 - Plants (Botany)
10
630 - Agriculture & related technologies
10
581 - Specific topics in natural history
7
720 - Architecture
7
340 - Law
5
370 - Education
5
140 - Specific philosophical schools
4
800 - Literature & rhetoric
4
530 - Physics
3
540 - Chemistry & allied sciences
3
576 - Genetics & evolution
3
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
100 - Philosophy & psychology
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
410 - Linguistics
1
658 - General management
1