books.google.com - These works, as the sub-title makes clear, are unfinished sketches for Philosophical Investigations, possibly the most important and influential philosophical work of modern times. The 'Blue Book' is a set of notes dictated to Witgenstein's Cambridge students in 1933-1934: the 'Brown Book' was a draft...http://books.google.com/books/about/The_Blue_and_Brown_Books.html?id=R7CxDSdN6mcC&utm_source=gb-gplus-shareThe Blue and Brown Books
