After many years it became true. On 15 April 2019 my book (only in German) was published by Books on Demand:

Gerhard Fischer, Katastrophenbegegnungen – Anekdoten und Episoden von der Helferfront. Mit einem Vorwort von Dr. Michael Feit

In a few days it shall be listed in catalogues of companies like Amazon, Hugendubel, Thalia, Osiander etc. The e-book version shall be available in two weeks.