Classification
910 - Geography & travel
144
551 - Geology, hydrology & meteorology
35
577 - Ecology
14
338 - Production
11
304 - Factors affecting social behavior
10
333 - Economics of land & energy
6
550 - Earth sciences
6
570 - Life sciences; biology
6
500 - Natural sciences & mathematics
5
624 - Civil engineering
5
320 - Political science
4
301 - Sociology & anthropology
3
330 - Economics
3
630 - Agriculture & related technologies
3
710 - Civic & landscape art
3
300 - Social sciences
2
306 - Culture & institutions
2
327 - International relations
2
363 - Other social problems & services
2
526 - Mathematical geography
2
580 - Plants (Botany)
2
658 - General management
2
900 - History & geography
2
000 - Computer science, information & general works
1
006 - Special computer methods
1
303 - Social processes
1
344 - Labor, social, education & cultural law
1
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
534 - Sound & related vibrations
1
541 - Physical chemistry
1
553 - Economic geology
1
591 - Specific topics in natural history
1
610 - Medicine & health
1
621 - Applied physics
1
627 - Hydraulic engineering
1
660 - Chemical engineering
1
700 - The arts; fine & decorative arts
1
770 - Photography, photographs & computer art
1
901 - Philosophy & theory
1
930 - History of ancient world to ca. 499
1
941 - British Isles
1