Classification
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153 - Mental processes & intelligence
1
160 - Logic
1
305 - Social groups
1
327 - International relations
1
344 - Labor, social, education & cultural law
1
352 - General considerations of public administration
1
400 - Language
1
401 - Philosophy & theory
1
510 - Mathematics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
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602 - Miscellany
1
613 - Personal health & safety
1
770 - Photography, photographs & computer art
1
910 - Geography & travel
1