Classification
500 - Natural sciences & mathematics
14
331 - Labor economics
4
510 - Mathematics
4
005 - Computer programming, programs & data
3
300 - Social sciences
3
000 - Computer science, information & general works
2
006 - Special computer methods
2
320 - Political science
2
330 - Economics
2
620 - Engineering & allied operations
2
658 - General management
2
070 - News media, journalism & publishing
1
153 - Mental processes & intelligence
1
155 - Differential & developmental psychology
1
302 - Social interaction
1
381 - Commerce
1
502 - Miscellany
1
621 - Applied physics
1
670 - Manufacturing
1
770 - Photography, photographs & computer art
1