Classification
551 - Geology, hydrology & meteorology
21
577 - Ecology
4
519 - Probabilities & applied mathematics
2
523 - Specific celestial bodies & phenomena
2
550 - Earth sciences
2
572 - Biochemistry
2
621 - Applied physics
2
910 - Geography & travel
2
388 - Transportation; ground transportation
1
539 - Modern physics
1
540 - Chemistry & allied sciences
1
573 - Specific physiological systems in animals
1
576 - Genetics & evolution
1
582 - Plants noted for characteristics & flowers
1
660 - Chemical engineering
1
720 - Architecture
1
743 - Drawing & drawings by subject
1