Classification
330 - Economics
42
320 - Political science
21
333 - Economics of land & energy
19
363 - Other social problems & services
12
900 - History & geography
12
610 - Medicine & health
10
304 - Factors affecting social behavior
9
700 - The arts; fine & decorative arts
9
000 - Computer science, information & general works
8
600 - Technology
7
370 - Education
6
140 - Specific philosophical schools
5
200 - Religion
5
820 - English & Old English literatures
5
933 - Palestine to 70
5
301 - Sociology & anthropology
4
362 - Social welfare problems & services
4
620 - Engineering & allied operations
4
720 - Architecture
4
340 - Law
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
800 - Literature & rhetoric
3
410 - Linguistics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
271 - Religious orders in church history
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
305 - Social groups
1
327 - International relations
1
338 - Production
1
346 - Private law
1
355 - Military science
1
400 - Language
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
510 - Mathematics
1
512 - Algebra
1
515 - Analysis
1
530 - Physics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
658 - General management
1
665 - Industrial oils, fats, waxes & gases
1
780 - Music
1
939 - Other parts of ancient world to ca. 640
1