Type XXI submarine (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Type XXI submarine" in English language version.

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7books.google.com

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1uboatarchive.net

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1u-boot-wilhelm-bauer.de

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1news.google.com

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books.google.com

Gordon Williamson (February 5, 2005). Wolf Pack: The Story of the U-Boat in World War II. Osprey. p. 59. ISBN 978-1841768724. Retrieved October 12, 2018.
Gordon Williamson (February 5, 2005). Wolf Pack: The Story of the U-Boat in World War II. Osprey. p. 58. ISBN 978-1841768724. Retrieved October 12, 2018.
Gordon Williamson (February 5, 2005). Wolf Pack: The Story of the U-Boat in World War II. Osprey. ISBN 978-1841768724. Retrieved October 12, 2018.
Gordon Williamson (February 5, 2005). Wolf Pack: The Story of the U-Boat in World War II. Osprey. p. 59. ISBN 978-1841768724. Retrieved October 12, 2018.
Gerken, Louis (1989). Torpedo Technology (Illustrated ed.). United States: Pennsylvania State University. p. 57. ISBN 978-0961716325. Retrieved 30 June 2017.
Gordon Williamson (February 5, 2005). Wolf Pack: The Story of the U-Boat in World War II. Osprey. p. 60. ISBN 978-1841768724. Retrieved October 12, 2018.
Gordon Williamson (2002). Kriegsmarine U-boats 1939–45. 841763640. ISBN 9781780966618.

news.google.com

"Truman Dives 440 Feet In German Sub", The Pittsburgh Press, November 21, 1946, p9

tv2.dk

nyheder.tv2.dk

Ritzau (13 April 2018). "Rare wreckage of groundbreaking nazi submarines found in the Skagerrak". tv2.dk (in Danish). Retrieved 13 April 2018.

u-boot-wilhelm-bauer.de

"History, U-Boot Wilhelm-Bauer". Museum Harbour of Bremerhaven. October 2, 2015. Retrieved October 11, 2018.

uboat.net

uboataces.com

"German Type IX U-Boat - history, specification and photos".

uboatarchive.net

"U-boat Archive - Design Studies - Type XXI".

ushmm.org

Marc Buggeln. "Neuengamme / Bremen-Farge". Holocaust Encyclopedia. United States Holocaust Memorial Museum. Retrieved 29 January 2011.

usnwc.edu

digital-commons.usnwc.edu

Jones, Marcus O. (2014) "Innovation for Its Own Sake: The Type XXI U-boat", Naval War College Review, Vol. 67, No. 2, Article 9 https://digital-commons.usnwc.edu/nwc-review/vol67/iss2/9%7C^{[permanent dead link]} p10 "Early Type XXI hulls suffered from defective diesel-engine superchargers, faulty hydraulic torpedo-loading systems, trouble-prone steering systems..."