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Library of Congress Call Numbers
The majority of books that you will come across in the Libraries will have a Library of Congress Call Number.
http://www.loc.gov/catdir/cpso/lccoNational Library of Medicine Call numbers
A product of the National Library of Medicine for the arrangement of library materials in the field of medicine and related sciences used internationally.
https://www.nlm.nih.gov/class/OutlineofNLMClassificationSchedule.html