Baedeker vs travelogue

Baedeker

noun
  • Any travel guide, advice for travelers, or guide pertaining to other subjects. 

name
  • A long-established series of travel guidebooks. 

travelogue

noun
  • A description of someone's travels, given in the form of narrative, public lecture, slide show or motion picture. 

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