Classification
551 - Geology, hydrology & meteorology
67
553 - Economic geology
24
549 - Mineralogy
15
550 - Earth sciences
15
624 - Civil engineering
13
050 - General serial publications
5
500 - Natural sciences & mathematics
4
526 - Mathematical geography
4
519 - Probabilities & applied mathematics
3
530 - Physics
3
541 - Physical chemistry
3
560 - Paleontology; paleozoology
3
577 - Ecology
3
910 - Geography & travel
3
006 - Special computer methods
2
300 - Social sciences
2
333 - Economics of land & energy
2
531 - Classical mechanics; solid mechanics
2
543 - Analytical chemistry
2
546 - Inorganic chemistry
2
570 - Life sciences; biology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
620 - Engineering & allied operations
2
001 - Knowledge
1
100 - Philosophy & psychology
1
344 - Labor, social, education & cultural law
1
363 - Other social problems & services
1
507 - Education, research & related topics
1
511 - General principles of mathematics
1
536 - Heat
1
540 - Chemistry & allied sciences
1
548 - Crystallography
1
572 - Biochemistry
1
579 - Microorganisms, fungi & algae
1
616 - Diseases
1
621 - Applied physics
1
662 - Explosives, fuels & related products
1
930 - History of ancient world to ca. 499
1