hark-back vs reminisce

hark-back

noun
  • An act of alluding, returning, or reverting (to a subject previously mentioned, etc.); also, an act of evoking, or longing or pining for (a past era or event). 

  • An act of hounds retracing a course in order to pick up the lost scent of prey. 

reminisce

noun
  • An act of reminiscence. 

verb
  • To recall the past in a private moment, often fondly or nostalgically. 

  • To talk or write about memories of the past, especially pleasant memories. 

  • To remember fondly; to reminisce about. 

How often have the words hark-back and reminisce occurred in a corpus of books? (source: Google Ngram Viewer )