Classification
333 - Economics of land & energy
62
370 - Education
52
100 - Philosophy & psychology
15
300 - Social sciences
9
500 - Natural sciences & mathematics
8
320 - Political science
7
363 - Other social problems & services
5
540 - Chemistry & allied sciences
5
900 - History & geography
5
600 - Technology
4
371 - Schools & their activities; special education
3
375 - Curricula
3
400 - Language
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
330 - Economics
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
200 - Religion
1
361 - Social problems & social welfare in general
1
378 - Higher education
1
380 - Commerce, communications & transportation
1
530 - Physics
1
657 - Accounting
1
745 - Decorative arts
1
973 - United States
1