2018-07-23. Retrieved 2018-07-22. Karremann, Jaime. "Instandhoudingsprogramma Walrusklasse (IP-W)". www.marineschepen.nl (in Dutch). Retrieved 2017-11-26. "Imtech...
7 KB (431 words) - 19:58, 1 June 2023
"Onderzeeboten "Walrusklasse"". www.navyinside.nl. Archived from the original on 2018-03-28. Retrieved 27 March 2018. "Walrusklasse onderzeeboten". www...
36 KB (3,365 words) - 15:18, 11 June 2024
Retrieved 17 December 2017. Karremann, Jaime. "Instandhoudingsprogramma Walrusklasse (IP-W)". www.marineschepen.nl (in Dutch). Archived from the original...
11 KB (725 words) - 01:36, 20 April 2024