Tractatus Network (German, English, Russian, Spanish, French, Italian / Data visualization) University of Iowa Tractatus Map(Both the Tractatus and the Prototractatus presented in the style of a subway map / German and English) Wittgensteiniana (interactive visualizations of the Tractatus, English and German versions available) 1921 non-fiction books Analytic philosophy literature Books by Ludwig Wittgenstein Cognitive science literature 20th-century philosophy Logic books Philosophical logic Philosophy books Philosophy of language literature Prison writings Treatises