What does the term "unmechanical" most likely mean as used in paragraph 95, paragraph 105, and paragraph 249? Cite evidence in your answer.

blank                                          that = (a) ok

the number of people with jobs in factories as unskilled workers increased.

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."