Classification
660 - Chemical engineering
631 - Techniques, equipment & materials
203
628 - Sanitary & municipal engineering
144
620 - Engineering & allied operations
71
500 - Natural sciences & mathematics
35
547 - Organic chemistry
25
658 - General management
5
600 - Technology
4
363 - Other social problems & services
3
745 - Decorative arts
3
331 - Labor economics
2
381 - Commerce
2
510 - Mathematics
2
540 - Chemistry & allied sciences
2
610 - Medicine & health
2
621 - Applied physics
2
153 - Mental processes & intelligence
1
170 - Ethics
1
361 - Social problems & social welfare in general
1
370 - Education
1
539 - Modern physics
1
549 - Mineralogy
1
571 - Physiology & related subjects
1
602 - Miscellany
1
670 - Manufacturing
1