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https://www.alws.at/de/ Austrian Ludwig Wittgenstein Society – Website of the ALWS ludwig wittgenstein austrian society website https://gutenberg.org/ebooks/5740 Tractatus Logico-Philosophicus by Ludwig Wittgenstein | Project Gutenberg Free eBook digitized and proofread by volunteers. ludwig wittgenstein project gutenberg logico https://plato.stanford.edu/entries/wittgenstein/ Ludwig Wittgenstein (Stanford Encyclopedia of Philosophy) ludwig wittgenstein stanford encyclopedia philosophy