Classification
577 - Ecology
15
591 - Specific topics in natural history
4
571 - Physiology & related subjects
2
155 - Differential & developmental psychology
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
338 - Production
1
340 - Law
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
510 - Mathematics
1
570 - Life sciences; biology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
595 - Arthropods
1
596 - Chordates
1
621 - Applied physics
1
630 - Agriculture & related technologies
1