Classification
530 - Physics
450
620 - Engineering & allied operations
395
543 - Analytical chemistry
361
700 - The arts; fine & decorative arts
273
600 - Technology
244
000 - Computer science, information & general works
217
621 - Applied physics
192
333 - Economics of land & energy
159
610 - Medicine & health
152
540 - Chemistry & allied sciences
147
900 - History & geography
135
541 - Physical chemistry
113
539 - Modern physics
98
580 - Plants (Botany)
81
547 - Organic chemistry
80
363 - Other social problems & services
63
140 - Specific philosophical schools
56
380 - Commerce, communications & transportation
53
546 - Inorganic chemistry
46
571 - Physiology & related subjects
45
572 - Biochemistry
40
576 - Genetics & evolution
39
414 - Phonology & phonetics
31
660 - Chemical engineering
31
330 - Economics
30
500 - Natural sciences & mathematics
29
630 - Agriculture & related technologies
27
537 - Electricity & electronics
26
615 - Pharmacology & therapeutics
25
535 - Light & infrared & ultraviolet phenomena
24
340 - Law
21
520 - Astronomy & allied sciences
21
616 - Diseases
21
551 - Geology, hydrology & meteorology
20
664 - Food technology
20
570 - Life sciences; biology
19
668 - Technology of other organic products
19
400 - Language
18
538 - Magnetism
17
612 - Human physiology
16
629 - Other branches of engineering
13
628 - Sanitary & municipal engineering
12
800 - Literature & rhetoric
12
574 - [Unassigned]
11
304 - Factors affecting social behavior
9
523 - Specific celestial bodies & phenomena
9
548 - Crystallography
9
930 - History of ancient world to ca. 499
9
549 - Mineralogy
8
581 - Specific topics in natural history
7
more ...