comic book vs paper trail

comic book

noun
  • A book or magazine that uses sequences of drawings to tell a story or series of stories, primarily in serialized form, usually fiction. 

paper trail

noun
  • A written record, history, or collection of evidence. 

  • Records left by a person or organization in the course of activities. 

  • Physical evidence of something that occurred in the past. 

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