Tractatus is available as a high quality and free/libre ebook from Standard Ebooks: https://standardebooks.org/ebooks/ludwig-wittgenstein/tractatus-logico-philo

Tractatus is available as a high quality and free/libre ebook from Standard Ebooks: https://standardebooks.org/ebooks/ludwig-wittgenstein/tractatus-logico-philosophicus/c-k-ogden https://standardebooks.org/ebooks/ludwig-wittgenstein/tracta... (This publication was a driving factor us in our production pipeline coping with MathML, and the necessary SVGs.)