Classification
330 - Economics
9
306 - Culture & institutions
6
610 - Medicine & health
6
320 - Political science
5
005 - Computer programming, programs & data
4
304 - Factors affecting social behavior
4
340 - Law
4
510 - Mathematics
4
303 - Social processes
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
418 - Standard usage & applied linguistics
3
572 - Biochemistry
3
658 - General management
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
305 - Social groups
2
327 - International relations
2
332 - Financial economics
2
612 - Human physiology
2
620 - Engineering & allied operations
2
624 - Civil engineering
2
809 - History, description & criticism
2
000 - Computer science, information & general works
1
003 - Systems
1
006 - Special computer methods
1
070 - News media, journalism & publishing
1
141 - Idealism & related systems
1
155 - Differential & developmental psychology
1
218 - Humankind
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
331 - Labor economics
1
338 - Production
1
346 - Private law
1
353 - Specific fields of public administration
1
355 - Military science
1
364 - Criminology
1
370 - Education
1
371 - Schools & their activities; special education
1
378 - Higher education
1
379 - Public policy issues in education
1
380 - Commerce, communications & transportation
1
428 - Standard English usage
1
500 - Natural sciences & mathematics
1
507 - Education, research & related topics
1
511 - General principles of mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
more ...