microfilm vs photography

microfilm

noun
  • a continuous roll of film containing photographs of documents at a greatly reduced size 

verb
  • to reproduce documents on such film 

photography

noun
  • The art and technology of producing images on photosensitive surfaces, and its digital counterpart. 

  • The occupation of taking (and often printing) photographs. 

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