blurb vs bumf

blurb

noun
  • A short description of a book, film, or other work, written and used for promotional purposes. 

verb
  • To supply with a blurb. 

  • To write or quote in a blurb. 

bumf

noun
  • Useless papers; now especially official documents, standardized forms, sales and marketing print material, etc. 

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