Classification
006 - Special computer methods
1
025 - Library operations
2
174 - Occupational ethics
1
304 - Factors affecting social behavior
1
306 - Culture & institutions
3
331 - Labor economics
1
333 - Economics of land & energy
7
334 - Cooperatives
1
338 - Production
11
344 - Labor, social, education & cultural law
2
346 - Private law
4
362 - Social welfare problems & services
2
363 - Other social problems & services
38
371 - Schools & their activities; special education
1
378 - Higher education
1
394 - General customs
1
507 - Education, research & related topics
6
509 - Historical, geographic & persons treatment
1
522 - Techniques, equipment & materials
1
523 - Specific celestial bodies & phenomena
1
530 - Physics
5
535 - Light & infrared & ultraviolet phenomena
1
537 - Electricity & electronics
3
538 - Magnetism
1
539 - Modern physics
5
540 - Chemistry & allied sciences
83
541 - Physical chemistry
90
542 - Techniques, equipment & materials
17
543 - Analytical chemistry
47
546 - Inorganic chemistry
31
547 - Organic chemistry
139
548 - Crystallography
4
549 - Mineralogy
3
551 - Geology, hydrology & meteorology
10
553 - Economic geology
6
571 - Physiology & related subjects
5
572 - Biochemistry
30
574 - [Unassigned]
24
576 - Genetics & evolution
2
577 - Ecology
7
579 - Microorganisms, fungi & algae
2
580 - Plants (Botany)
1
581 - Specific topics in natural history
9
582 - Plants noted for characteristics & flowers
1
595 - Arthropods
1
599 - Mammals
2
604 - Special topics
1
606 - Organizations
1
607 - Education, research & related topics
1
610 - Medicine & health
15
more ...