Classification
006 - Special computer methods
3
320 - Political science
2
306 - Culture & institutions
1
327 - International relations
1
331 - Labor economics
1
340 - Law
1
364 - Criminology
1
370 - Education
1
371 - Schools & their activities; special education
1
372 - Elementary education
1
378 - Higher education
1
507 - Education, research & related topics
1
510 - Mathematics
1
512 - Algebra
1
523 - Specific celestial bodies & phenomena
1
610 - Medicine & health
1