portfolio vs quarto

portfolio

noun
  • A case for carrying papers, drawings, photographs, maps and other flat documents. 

  • The post and the responsibilities of a cabinet minister or other head of a government department. 

  • A collection of assets; (figurative) any collection of things considered as investments or assets. 

  • A range of products. 

  • The collection of such documents, especially the works of an artist or photographer. 

  • The group of investments and other assets held by an investor. 

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 portfolio and quarto occurred in a corpus of books? (source: Google Ngram Viewer )