De verdwijn-machine, by Kees Valkenstein 75301 [Author: Kees Valkenstein] [Language: Dutch] [Link: https://www.gutenberg.org/ebooks/75301] note: link will be active within two hours of posting. Thanks to Jeroen Hellingman, Dwight Decker and the Online Distributed Proofreading Team at https://www.pgdp.net/ for Project Gutenberg Regards, Al