Classification
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350 - Public administration & military science
2
355 - Military science
2
361 - Social problems & social welfare in general
4
363 - Other social problems & services
91
364 - Criminology
4
370 - Education
77
371 - Schools & their activities; special education
1
375 - Curricula
2
380 - Commerce, communications & transportation
77
381 - Commerce
8
384 - Communications; telecommunication
5
394 - General customs
1
398 - Folklore
37
400 - Language
247
410 - Linguistics
317
414 - Phonology & phonetics
15
430 - Germanic languages; German
1
480 - Hellenic languages; classical Greek
1
490 - Other languages
1
491 - East Indo-European & Celtic languages
7
499 - Austronesian & other languages
1
500 - Natural sciences & mathematics
53
509 - Historical, geographic & persons treatment
1
510 - Mathematics
3
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
4
530 - Physics
23
540 - Chemistry & allied sciences
17
551 - Geology, hydrology & meteorology
29
576 - Genetics & evolution
53
577 - Ecology
1
580 - Plants (Botany)
43
581 - Specific topics in natural history
20
590 - Animals (Zoology)
3
600 - Technology
133
610 - Medicine & health
95
612 - Human physiology
3
615 - Pharmacology & therapeutics
2
616 - Diseases
1
620 - Engineering & allied operations
76
621 - Applied physics
1
629 - Other branches of engineering
2
630 - Agriculture & related technologies
25
647 - Management of public households
2
650 - Management & auxiliary services
30
657 - Accounting
3
658 - General management
48
659 - Advertising & public relations
1
670 - Manufacturing
2
700 - The arts; fine & decorative arts
491
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