Classification
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354 - Administration of economy & environment
1
361 - Social problems & social welfare in general
4
362 - Social welfare problems & services
1
363 - Other social problems & services
10
364 - Criminology
3
370 - Education
13
371 - Schools & their activities; special education
10
374 - Adult education
1
375 - Curricula
1
378 - Higher education
6
380 - Commerce, communications & transportation
16
381 - Commerce
6
382 - International commerce
4
384 - Communications; telecommunication
7
387 - Water, air & space transportation
1
388 - Transportation; ground transportation
1
407 - Education, research & related topics
1
410 - Linguistics
1
414 - Phonology & phonetics
1
418 - Standard usage & applied linguistics
3
427 - English language variations
1
430 - Germanic languages; German
1
490 - Other languages
2
495 - Languages of East & Southeast Asia
2
499 - Austronesian & other languages
1
500 - Natural sciences & mathematics
10
501 - Philosophy & theory
2
507 - Education, research & related topics
3
509 - Historical, geographic & persons treatment
3
510 - Mathematics
6
511 - General principles of mathematics
1
512 - Algebra
2
515 - Analysis
3
518 - Numerical analysis
9
519 - Probabilities & applied mathematics
3
520 - Astronomy & allied sciences
7
523 - Specific celestial bodies & phenomena
2
530 - Physics
5
531 - Classical mechanics; solid mechanics
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
550 - Earth sciences
7
551 - Geology, hydrology & meteorology
18
560 - Paleontology; paleozoology
1
570 - Life sciences; biology
6
571 - Physiology & related subjects
6
572 - Biochemistry
2
577 - Ecology
20
579 - Microorganisms, fungi & algae
3
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