Classification
372 - Elementary education
85
370 - Education
38
306 - Culture & institutions
12
330 - Economics
12
305 - Social groups
11
700 - The arts; fine & decorative arts
11
507 - Education, research & related topics
8
510 - Mathematics
7
100 - Philosophy & psychology
6
333 - Economics of land & energy
5
362 - Social welfare problems & services
4
400 - Language
4
418 - Standard usage & applied linguistics
4
140 - Specific philosophical schools
3
301 - Sociology & anthropology
3
320 - Political science
3
371 - Schools & their activities; special education
3
610 - Medicine & health
3
900 - History & geography
3
155 - Differential & developmental psychology
2
300 - Social sciences
2
401 - Philosophy & theory
2
780 - Music
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
120 - Epistemology, causation & humankind
1
153 - Mental processes & intelligence
1
303 - Social processes
1
304 - Factors affecting social behavior
1
338 - Production
1
340 - Law
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
374 - Adult education
1
490 - Other languages
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
660 - Chemical engineering
1
808 - Rhetoric & collections of literature
1
910 - Geography & travel
1