Classification
720 - Architecture
56
700 - The arts; fine & decorative arts
39
333 - Economics of land & energy
18
900 - History & geography
16
363 - Other social problems & services
15
320 - Political science
13
300 - Social sciences
8
330 - Economics
7
301 - Sociology & anthropology
6
380 - Commerce, communications & transportation
6
140 - Specific philosophical schools
5
551 - Geology, hydrology & meteorology
5
600 - Technology
5
340 - Law
3
370 - Education
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
364 - Criminology
2
581 - Specific topics in natural history
2
770 - Photography, photographs & computer art
2
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1