Classification
940 - History of Europe
17
361 - Social problems & social welfare in general
9
330 - Economics
7
941 - British Isles
7
304 - Factors affecting social behavior
5
306 - Culture & institutions
5
320 - Political science
5
327 - International relations
5
305 - Social groups
4
338 - Production
4
621 - Applied physics
4
930 - History of ancient world to ca. 499
4
325 - International migration & colonization
3
370 - Education
3
418 - Standard usage & applied linguistics
3
520 - Astronomy & allied sciences
3
791 - Public performances
3
302 - Social interaction
2
341 - Law of nations
2
345 - Criminal law
2
509 - Historical, geographic & persons treatment
2
510 - Mathematics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
809 - History, description & criticism
2
900 - History & geography
2
910 - Geography & travel
2
943 - Central Europe; Germany
2
945 - Italian Peninsula & adjacent islands
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
025 - Library operations
1
100 - Philosophy & psychology
1
109 - Historical & collected persons treatment
1
142 - Critical philosophy
1
160 - Logic
1
170 - Ethics
1
230 - Christianity & Christian theology
1
301 - Sociology & anthropology
1
303 - Social processes
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
518 - Numerical analysis
1
526 - Mathematical geography
1
531 - Classical mechanics; solid mechanics
1
539 - Modern physics
1
570 - Life sciences; biology
1
more ...