https://archive.org/details/oswald-spengler-der-mensch-und-die-technik
https://archive.org/details/die-begegnung-mit-dem-leid-howard-c.-cuttler-dalai-lama
https://archive.org/details/univ.-prof.-joachim-bauer-das-empathische-gen
https://archive.org/details/gezeichnete-des-schicksals-lara-adrian
https://archive.org/details/hoimar-von-ditfurth-das-magische-fenster
https://archive.org/details/gehort-skeptizismus-zur-wissenschaft-sternstunde-philosophie-srf-kultur
https://archive.org/details/grusel-glaube-und-genie-gotik-arte_202111