Classification
551 - Geology, hydrology & meteorology
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
2
320 - Political science
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
770 - Photography, photographs & computer art
1
900 - History & geography
1