Hr.Ms. O 21 (1940) (Dutch Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hr.Ms. O 21 (1940)" in Dutch language version.

refsWebsite

Global rank Dutch rank

1dutchsubmarines.com

low place

1,750^th place

1web.archive.org

1^st place

1^st place

2,553^rd place

2,354^th place

dutchsubmarines.com

(en) Dutchsubmarines.com :: O 21. Gearchiveerd op 29 januari 2021.

uboat.net

(en) Uboat.net :: U-boots sunk by submarines

web.archive.org

(en) Dutchsubmarines.com :: O 21. Gearchiveerd op 29 januari 2021.