Classification
620 - Engineering & allied operations
530 - Physics
7
540 - Chemistry & allied sciences
3
333 - Economics of land & energy
2
541 - Physical chemistry
2
600 - Technology
2
667 - Cleaning, color & coating technologies
2
000 - Computer science, information & general works
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
621 - Applied physics
1
900 - History & geography
1