Classification
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
26
333 - Economics of land & energy
25
900 - History & geography
25
363 - Other social problems & services
15
000 - Computer science, information & general works
14
140 - Specific philosophical schools
13
330 - Economics
9
610 - Medicine & health
9
720 - Architecture
9
320 - Political science
7
340 - Law
7
500 - Natural sciences & mathematics
7
630 - Agriculture & related technologies
4
658 - General management
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
370 - Education
3
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
170 - Ethics
2
300 - Social sciences
2
530 - Physics
2
581 - Specific topics in natural history
2
200 - Religion
1
410 - Linguistics
1
650 - Management & auxiliary services
1
657 - Accounting
1
770 - Photography, photographs & computer art
1