Classification
330 - Economics
8
577 - Ecology
7
333 - Economics of land & energy
6
550 - Earth sciences
6
551 - Geology, hydrology & meteorology
6
910 - Geography & travel
4
001 - Knowledge
3
300 - Social sciences
3
331 - Labor economics
3
500 - Natural sciences & mathematics
3
531 - Classical mechanics; solid mechanics
3
304 - Factors affecting social behavior
2
658 - General management
2
005 - Computer programming, programs & data
1
006 - Special computer methods
1
303 - Social processes
1
306 - Culture & institutions
1
338 - Production
1
381 - Commerce
1
515 - Analysis
1
519 - Probabilities & applied mathematics
1
532 - Fluid mechanics; liquid mechanics
1
549 - Mineralogy
1
591 - Specific topics in natural history
1
620 - Engineering & allied operations
1
621 - Applied physics
1
622 - Mining & related operations
1
627 - Hydraulic engineering
1
641 - Food & drink
1
664 - Food technology
1