Classification
510 - Mathematics
405
370 - Education
131
519 - Probabilities & applied mathematics
34
512 - Algebra
28
516 - Geometry
25
507 - Education, research & related topics
19
515 - Analysis
19
371 - Schools & their activities; special education
17
500 - Natural sciences & mathematics
14
003 - Systems
7
372 - Elementary education
7
511 - General principles of mathematics
6
330 - Economics
4
300 - Social sciences
3
306 - Culture & institutions
3
320 - Political science
3
374 - Adult education
3
378 - Higher education
3
540 - Chemistry & allied sciences
3
900 - History & geography
3
004 - Data processing & computer science
2
501 - Philosophy & theory
2
514 - Topology
2
518 - Numerical analysis
2
530 - Physics
2
570 - Life sciences; biology
2
624 - Civil engineering
2
006 - Special computer methods
1
100 - Philosophy & psychology
1
160 - Logic
1
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
355 - Military science
1
379 - Public policy issues in education
1
418 - Standard usage & applied linguistics
1
509 - Historical, geographic & persons treatment
1
520 - Astronomy & allied sciences
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
621 - Applied physics
1
658 - General management
1
794 - Indoor games of skill
1