https://archive.org/details/hans-saner-sinn-und-aufgabe-der-philosophie
https://archive.org/details/philosophisches-gesprach-hannah-arendt-und-der-ursprung-totalitarer-herrschaft
https://archive.org/details/martin-hartmann-alle-wollen-vertrauen-niemand-will-vertrauen
https://archive.org/details/knop-und-niehaus-kurkuma-ohne-effekt-fast-alle-mache-diese-3-fehler
https://archive.org/details/ist-die-physik-auserforscht-terra-x
https://archive.org/details/gianrico-carofiglio-in-freiem-fall
https://archive.org/details/paul-watzlawick-warum-wir-nicht-nicht-kommunizieren-konnen