https://allthatsinteresting.com/landkreuzer-p-1000-ratte

https://en.wikipedia.org/wiki/Landkreuzer_P._1000_Ratte

https://historyofyesterday.com/the-landkreuzer-p-1000-ratte-ee2b7615441b

https://www.warhistoryonline.com/instant-articles/the-ridiculous-1000-ton-landkreuzer-p-1000-ratte.html

https://www.historynet.com/hitlers-monster-tanks/

https://www.youtube.com/watch?v=D8TvR6pU0J8