muskeg vs polder

muskeg

noun
  • A terrain composed of peat bog with tussocky meadow and woody vegetation including spruce. 

polder

noun
  • An area of ground reclaimed from a sea or lake by means of dikes. 

verb
  • To reclaim an area of ground from a sea or lake by means of dikes. 

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