Classification
003 - Systems
1
004 - Data processing & computer science
1
005 - Computer programming, programs & data
2
006 - Special computer methods
11
158 - Applied psychology
2
333 - Economics of land & energy
7
338 - Production
3
362 - Social welfare problems & services
1
363 - Other social problems & services
1
370 - Education
3
519 - Probabilities & applied mathematics
7
530 - Physics
2
539 - Modern physics
1
551 - Geology, hydrology & meteorology
3
553 - Economic geology
2
581 - Specific topics in natural history
1
610 - Medicine & health
2
613 - Personal health & safety
1
616 - Diseases
2
620 - Engineering & allied operations
6
621 - Applied physics
13
624 - Civil engineering
7
627 - Hydraulic engineering
2
628 - Sanitary & municipal engineering
5
629 - Other branches of engineering
7
641 - Food & drink
6
658 - General management
8
660 - Chemical engineering
6
664 - Food technology
6
670 - Manufacturing
14
690 - Buildings
4