Classification
380 - Commerce, communications & transportation
580 - Plants (Botany)
29
630 - Agriculture & related technologies
27
000 - Computer science, information & general works
26
363 - Other social problems & services
26
610 - Medicine & health
21
333 - Economics of land & energy
20
600 - Technology
19
620 - Engineering & allied operations
18
700 - The arts; fine & decorative arts
17
330 - Economics
16
551 - Geology, hydrology & meteorology
15
140 - Specific philosophical schools
11
576 - Genetics & evolution
11
581 - Specific topics in natural history
9
612 - Human physiology
7
900 - History & geography
7
300 - Social sciences
6
320 - Political science
4
414 - Phonology & phonetics
4
500 - Natural sciences & mathematics
4
540 - Chemistry & allied sciences
4
720 - Architecture
4
100 - Philosophy & psychology
3
170 - Ethics
3
340 - Law
3
370 - Education
3
658 - General management
3
800 - Literature & rhetoric
3
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
362 - Social welfare problems & services
1
530 - Physics
1
657 - Accounting
1