Classification
304 - Factors affecting social behavior
55
720 - Architecture
36
333 - Economics of land & energy
20
690 - Buildings
15
910 - Geography & travel
14
307 - Communities
13
577 - Ecology
8
338 - Production
7
306 - Culture & institutions
6
320 - Political science
6
624 - Civil engineering
6
629 - Other branches of engineering
6
658 - General management
5
900 - History & geography
5
363 - Other social problems & services
4
710 - Civic & landscape art
4
003 - Systems
3
006 - Special computer methods
3
330 - Economics
3
610 - Medicine & health
3
621 - Applied physics
3
634 - Orchards, fruits & forestry
3
650 - Management & auxiliary services
3
155 - Differential & developmental psychology
2
344 - Labor, social, education & cultural law
2
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
696 - Utilities
2
700 - The arts; fine & decorative arts
2
725 - Public structures
2
004 - Data processing & computer science
1
007 - [Unassigned]
1
150 - Psychology
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
303 - Social processes
1
337 - International economics
1
339 - Macroeconomics & related topics
1
343 - Military, tax, trade & industrial law
1
361 - Social problems & social welfare in general
1
510 - Mathematics
1
530 - Physics
1
541 - Physical chemistry
1
578 - Natural history of organisms
1
613 - Personal health & safety
1
614 - Incidence & prevention of disease
1
616 - Diseases
1
more ...