Classification
333 - Economics of land & energy
330 - Economics
21
363 - Other social problems & services
17
630 - Agriculture & related technologies
16
000 - Computer science, information & general works
13
320 - Political science
12
700 - The arts; fine & decorative arts
12
380 - Commerce, communications & transportation
8
600 - Technology
8
900 - History & geography
8
551 - Geology, hydrology & meteorology
7
580 - Plants (Botany)
7
304 - Factors affecting social behavior
6
610 - Medicine & health
6
658 - General management
6
620 - Engineering & allied operations
5
140 - Specific philosophical schools
4
576 - Genetics & evolution
4
361 - Social problems & social welfare in general
3
720 - Architecture
3
200 - Religion
2
300 - Social sciences
2
301 - Sociology & anthropology
2
370 - Education
2
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
340 - Law
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1