handbill vs writing pad

handbill

noun
  • A loose printed sheet, to be distributed by hand. 

  • A chopping instrument; billhook. 

  • A pruning hook. 

writing pad

noun
  • A collection of blank pages of writing paper, bound together, often with a cardboard cover 

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