Classification
307 - Communities
391
304 - Factors affecting social behavior
274
306 - Culture & institutions
43
910 - Geography & travel
39
333 - Economics of land & energy
38
305 - Social groups
33
363 - Other social problems & services
16
330 - Economics
15
621 - Applied physics
14
629 - Other branches of engineering
11
361 - Social problems & social welfare in general
10
006 - Special computer methods
9
320 - Political science
9
551 - Geology, hydrology & meteorology
9
302 - Social interaction
8
720 - Architecture
8
003 - Systems
7
301 - Sociology & anthropology
6
338 - Production
6
577 - Ecology
6
624 - Civil engineering
6
690 - Buildings
6
033 - Encyclopedias in other Germanic languages
5
300 - Social sciences
5
303 - Social processes
5
364 - Criminology
5
613 - Personal health & safety
5
628 - Sanitary & municipal engineering
5
658 - General management
5
660 - Chemical engineering
5
004 - Data processing & computer science
3
005 - Computer programming, programs & data
3
515 - Analysis
3
610 - Medicine & health
3
630 - Agriculture & related technologies
3
090 - Manuscripts & rare books
2
351 - Public administration
2
500 - Natural sciences & mathematics
2
519 - Probabilities & applied mathematics
2
530 - Physics
2
571 - Physiology & related subjects
2
614 - Incidence & prevention of disease
2
696 - Utilities
2
700 - The arts; fine & decorative arts
2
809 - History, description & criticism
2
011 - Bibliographies
1
030 - General encyclopedic works
1
036 - Encyclopedias in Spanish & Portuguese
1
150 - Psychology
1
155 - Differential & developmental psychology
1
more ...