32 books • 7 series
Book #11: General Theory of Knowledge
Book #1: Allgemeine Erkenntnislehre
Book #4: Zurich, Berlin, Rostock
Book #2: Abriss Der Logistik
Book #8: Logische Syntax Der Sprache
Book #2: Prolegomena to a Critical Grammar
Book #18: The Problems of Philosophy in Their Interconnection
Book #21: Ethics and the Will