Classification
551 - Geology, hydrology & meteorology
66
550 - Earth sciences
31
549 - Mineralogy
10
520 - Astronomy & allied sciences
8
526 - Mathematical geography
5
560 - Paleontology; paleozoology
5
001 - Knowledge
3
300 - Social sciences
3
363 - Other social problems & services
3
500 - Natural sciences & mathematics
3
501 - Philosophy & theory
3
553 - Economic geology
3
576 - Genetics & evolution
3
620 - Engineering & allied operations
3
333 - Economics of land & energy
2
523 - Specific celestial bodies & phenomena
2
530 - Physics
2
541 - Physical chemistry
2
571 - Physiology & related subjects
2
577 - Ecology
2
590 - Animals (Zoology)
2
621 - Applied physics
2
910 - Geography & travel
2
000 - Computer science, information & general works
1
006 - Special computer methods
1
341 - Law of nations
1
414 - Phonology & phonetics
1
509 - Historical, geographic & persons treatment
1
510 - Mathematics
1
531 - Classical mechanics; solid mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
540 - Chemistry & allied sciences
1
745 - Decorative arts
1
919 - Geography of & travel in other areas
1
939 - Other parts of ancient world to ca. 640
1