Classification
333 - Economics of land & energy
11
307 - Communities
10
338 - Production
8
304 - Factors affecting social behavior
6
577 - Ecology
6
363 - Other social problems & services
5
624 - Civil engineering
4
658 - General management
4
711 - Area planning
4
629 - Other branches of engineering
3
690 - Buildings
3
710 - Civic & landscape art
3
306 - Culture & institutions
2
364 - Criminology
2
613 - Personal health & safety
2
630 - Agriculture & related technologies
2
302 - Social interaction
1
344 - Labor, social, education & cultural law
1
614 - Incidence & prevention of disease
1
720 - Architecture
1
930 - History of ancient world to ca. 499
1