Classification
550 - Earth sciences
215
526 - Mathematical geography
196
551 - Geology, hydrology & meteorology
114
520 - Astronomy & allied sciences
57
624 - Civil engineering
15
621 - Applied physics
12
530 - Physics
10
500 - Natural sciences & mathematics
8
549 - Mineralogy
7
629 - Other branches of engineering
6
519 - Probabilities & applied mathematics
5
534 - Sound & related vibrations
5
363 - Other social problems & services
4
515 - Analysis
4
523 - Specific celestial bodies & phenomena
4
577 - Ecology
4
620 - Engineering & allied operations
4
333 - Economics of land & energy
3
541 - Physical chemistry
3
553 - Economic geology
3
320 - Political science
2
531 - Classical mechanics; solid mechanics
2
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
571 - Physiology & related subjects
2
003 - Systems
1
006 - Special computer methods
1
158 - Applied psychology
1
514 - Topology
1
516 - Geometry
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
537 - Electricity & electronics
1
539 - Modern physics
1
610 - Medicine & health
1
625 - Engineering of railroads & roads
1
628 - Sanitary & municipal engineering
1
662 - Explosives, fuels & related products
1
710 - Civic & landscape art
1
910 - Geography & travel
1
930 - History of ancient world to ca. 499
1