Open Library is a great place for reading thousands of books online specially the ones which are very old and in some cases are out of print even. I am reading “Psychology of advertising in theory and practice” book at the moment written by Walter Dill Scott in 1921. Fascinating to see a book that old talking about illusion, perception, memory recall, instinct, and so on and relate that with advertising. Also interesting is to see some old ads, visuals, copyright just exciting.