Classification
prev ...
352 - General considerations of public administration
14
361 - Social problems & social welfare in general
2
362 - Social welfare problems & services
2
363 - Other social problems & services
18
364 - Criminology
2
368 - Insurance
36
370 - Education
10
371 - Schools & their activities; special education
4
374 - Adult education
12
380 - Commerce, communications & transportation
85
381 - Commerce
245
382 - International commerce
2
384 - Communications; telecommunication
135
388 - Transportation; ground transportation
2
410 - Linguistics
1
418 - Standard usage & applied linguistics
1
420 - English & Old English
1
500 - Natural sciences & mathematics
1,430
509 - Historical, geographic & persons treatment
1
510 - Mathematics
18
515 - Analysis
8
519 - Probabilities & applied mathematics
24
520 - Astronomy & allied sciences
1
530 - Physics
3
531 - Classical mechanics; solid mechanics
6
534 - Sound & related vibrations
1
536 - Heat
2
540 - Chemistry & allied sciences
1
546 - Inorganic chemistry
1
551 - Geology, hydrology & meteorology
6
553 - Economic geology
2
570 - Life sciences; biology
1
577 - Ecology
1
590 - Animals (Zoology)
1
600 - Technology
10
604 - Special topics
1
607 - Education, research & related topics
1
610 - Medicine & health
8
613 - Personal health & safety
3
614 - Incidence & prevention of disease
1
615 - Pharmacology & therapeutics
1
616 - Diseases
1
620 - Engineering & allied operations
153
621 - Applied physics
115
622 - Mining & related operations
2
624 - Civil engineering
233
627 - Hydraulic engineering
2
628 - Sanitary & municipal engineering
7
629 - Other branches of engineering
170
630 - Agriculture & related technologies
2
more ...