Classification
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363 - Other social problems & services
160
364 - Criminology
20
368 - Insurance
22
370 - Education
40
371 - Schools & their activities; special education
27
372 - Elementary education
12
373 - Secondary education
13
374 - Adult education
5
376 - [Unassigned]
8
378 - Higher education
11
379 - Public policy issues in education
29
380 - Commerce, communications & transportation
4
381 - Commerce
1
382 - International commerce
76
384 - Communications; telecommunication
22
385 - Railroad transportation
1
387 - Water, air & space transportation
8
388 - Transportation; ground transportation
23
399 - Customs of war & diplomacy
1
551 - Geology, hydrology & meteorology
3
607 - Education, research & related topics
1
610 - Medicine & health
1
613 - Personal health & safety
5
614 - Incidence & prevention of disease
14
615 - Pharmacology & therapeutics
4
616 - Diseases
3
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
621 - Applied physics
3
627 - Hydraulic engineering
3
628 - Sanitary & municipal engineering
3
629 - Other branches of engineering
2
630 - Agriculture & related technologies
15
631 - Techniques, equipment & materials
2
634 - Orchards, fruits & forestry
4
639 - Hunting, fishing & conservation
1
651 - Office services
1
657 - Accounting
10
658 - General management
35
662 - Explosives, fuels & related products
1
697 - Heating, ventilating & air-conditioning
1
709 - Historical, geographic & persons treatment
1
808 - Rhetoric & collections of literature
1
939 - Other parts of ancient world to ca. 640
1
949 - Other parts of Europe
1
956 - Middle East (Near East)
1