Classification
304 - Factors affecting social behavior
12
305 - Social groups
1
320 - Political science
2
327 - International relations
1
333 - Economics of land & energy
49
338 - Production
4
344 - Labor, social, education & cultural law
2
363 - Other social problems & services
9
500 - Natural sciences & mathematics
2
519 - Probabilities & applied mathematics
4
530 - Physics
1
539 - Modern physics
1
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
8
560 - Paleontology; paleozoology
1
570 - Life sciences; biology
2
571 - Physiology & related subjects
11
572 - Biochemistry
3
577 - Ecology
172
578 - Natural history of organisms
7
579 - Microorganisms, fungi & algae
8
580 - Plants (Botany)
22
581 - Specific topics in natural history
24
582 - Plants noted for characteristics & flowers
1
590 - Animals (Zoology)
1
592 - Invertebrates
5
595 - Arthropods
3
612 - Human physiology
1
620 - Engineering & allied operations
3
621 - Applied physics
6
624 - Civil engineering
1
628 - Sanitary & municipal engineering
5
630 - Agriculture & related technologies
27
631 - Techniques, equipment & materials
15
634 - Orchards, fruits & forestry
161
658 - General management
1
660 - Chemical engineering
12
664 - Food technology
1
690 - Buildings
1
910 - Geography & travel
5