shelving vs upslope

shelving

adj

  • sloping steeply 

noun

  • The side-rails of a cart or waggon. 

  • The bank of a river etc. 

  • Shelves collectively. 

upslope

adj

  • in a direction up a slope 

adv

  • up a slope 

noun

  • an upward slope 

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