https://archive.org/details/m.-c.-escher-reise-in-die-unendlichkeit-arte
https://archive.org/details/griechische-sagen-vom-anbeginn-der-zeit
https://archive.org/details/epikur-sein-leben-und-seine-praktische-philosophie
https://archive.org/details/griechische-mythologie-die-argonautensage
https://archive.org/details/mord-der-antike-meister-detektive
https://archive.org/details/der-moormann
https://archive.org/details/marcus-tullius-cicero
https://archive.org/details/erich-von-daniken-auf-den-spuren-der-allmachtigen