Classification
330 - Economics
137
320 - Political science
132
340 - Law
68
610 - Medicine & health
25
700 - The arts; fine & decorative arts
25
380 - Commerce, communications & transportation
18
333 - Economics of land & energy
13
000 - Computer science, information & general works
12
140 - Specific philosophical schools
11
540 - Chemistry & allied sciences
9
570 - Life sciences; biology
9
580 - Plants (Botany)
7
900 - History & geography
5
600 - Technology
4
620 - Engineering & allied operations
4
576 - Genetics & evolution
3
100 - Philosophy & psychology
2
363 - Other social problems & services
2
388 - Transportation; ground transportation
2
414 - Phonology & phonetics
2
625 - Engineering of railroads & roads
2
940 - History of Europe
2
370 - Education
1
520 - Astronomy & allied sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
680 - Manufacture for specific uses
1
820 - English & Old English literatures
1
910 - Geography & travel
1