Classification
549 - Mineralogy
243
551 - Geology, hydrology & meteorology
222
540 - Chemistry & allied sciences
45
550 - Earth sciences
43
620 - Engineering & allied operations
34
624 - Civil engineering
28
541 - Physical chemistry
26
363 - Other social problems & services
22
700 - The arts; fine & decorative arts
20
330 - Economics
16
000 - Computer science, information & general works
15
333 - Economics of land & energy
15
621 - Applied physics
15
553 - Economic geology
14
320 - Political science
13
600 - Technology
13
548 - Crystallography
12
900 - History & geography
12
910 - Geography & travel
11
546 - Inorganic chemistry
8
500 - Natural sciences & mathematics
7
523 - Specific celestial bodies & phenomena
7
577 - Ecology
7
526 - Mathematical geography
5
530 - Physics
5
576 - Genetics & evolution
5
380 - Commerce, communications & transportation
4
520 - Astronomy & allied sciences
4
543 - Analytical chemistry
4
631 - Techniques, equipment & materials
4
571 - Physiology & related subjects
3
578 - Natural history of organisms
3
581 - Specific topics in natural history
3
622 - Mining & related operations
3
630 - Agriculture & related technologies
3
660 - Chemical engineering
3
720 - Architecture
3
930 - History of ancient world to ca. 499
3
006 - Special computer methods
2
338 - Production
2
340 - Law
2
414 - Phonology & phonetics
2
519 - Probabilities & applied mathematics
2
539 - Modern physics
2
547 - Organic chemistry
2
552 - Petrology
2
572 - Biochemistry
2
579 - Microorganisms, fungi & algae
2
580 - Plants (Botany)
2
628 - Sanitary & municipal engineering
2
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