handbook vs quarto

handbook

noun
  • A topically organized book of reference on a certain field of knowledge, regardless of size. 

  • A place where illicit bets can be placed. 

quarto

noun
  • A book size, corresponding to the paper size. 

  • Quarto writing paper (10 inches x 8 inches) 

  • A size of paper (7.5"-10" x 10"-12.5" or 190-254 x 254-312 mm). Formed by folding and cutting one of several standard sizes of paper (15"-20" x 20"-25" or 381-508 x 508-635 mm) twice to form 4 leaves (eight sides). 

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