Saturday-night special vs thirty-eight

Saturday-night special

noun
  • An inexpensive, easily obtained handgun. 

  • An unexpected takeover bid that gives its opponents little time to respond. 

thirty-eight

num
  • The cardinal number immediately following thirty-seven and preceding thirty-nine. 

How often have the words Saturday-night special and thirty-eight occurred in a corpus of books? (source: Google Ngram Viewer )