curator vs salvager

curator

noun
  • A person who manages, administers or organizes a collection, either independently or employed by a museum, library, archive or zoo. 

  • A member of a curatorium, a board for electing university professors, etc. 

  • One appointed to act as guardian of the estate of a person not legally competent to manage it, or of an absentee; a trustee. 

salvager

noun
  • A person who engages in salvage work 

How often have the words curator and salvager occurred in a corpus of books? (source: Google Ngram Viewer )