alpenstock vs white cane

alpenstock

noun
  • A stout adjustable walking stick with a metal point, used by mountain climbers and walkers in hilly or uneven terrain. 

white cane

noun
  • A white stick carried by a blind or visually impaired person, indicating their disability to others and allowing them to scan the surroundings for obstacles etc. 

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