#library.aggregation  a collection of literary documents or records kept for reference or borrowing
  supertype:  #aggregation__collection__accumulation__assemblage  several things grouped together
  subtype:  #bibliotheca  a collection of books
  subtype:  #public_library  a nonprofit library maintained for public use
  subtype:  #rental_collection  a collection of books that can be rented by readers in return for a small daily fee

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