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
It is now also available as E-book in catalogues of companies like Amazon, Hugendubel, Thalia, Osiander etc.
I am looking forward to receiving any kind of feedback!