Boole, "An Investigation into the Laws of Thought": https://books.google.com/books?id=DqwAAAAAcAAJ&printsec=frontcover&dq=An+Investigation+of+the+Laws+of+Though

Boole, "An Investigation into the Laws of Thought": https://books.google.com/books?id=DqwAAAAAcAAJ&printsec=frontcover&dq=An+Investigation+of+the+Laws+of+Thought&hl=en&sa=X&ved=0ahUKEwiR16L0nb7UAhWCbT4KHX3NBrwQ6AEIIjAA#v=onepage&q&f=false https://books.google.com/books?id=DqwAAAAAcAAJ&printsec=fron...