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https://books.google.com/books?id=EqgFnAZEPhgC&pg=PA80&dq=alexander graham bell mathematics&hl=en&sa=X&ved=0CDAQ6AEwBDgKahUKEwj7tpKczp3IAhVREJIKHYvGBv0#v=onepage&q=mathematical&f=false