inscription vs travel book

inscription

noun
  • Words written in the front of a book as a dedication. 

  • Text carved on a wall or plaque, such as a memorial or gravestone. 

  • The text on a coin. 

  • The act of inscribing. 

travel book

noun
  • A book about travelling to a certain region, such as a memoir or guide book. 

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