Sources

The following webpages contain material related to U-86:

www.dreadnoughtproject.org

The plans for U-63 were found on this webpage. The page also contains a wealth of information relating to naval technology of WW1.

www.wlb-stuttgart.de/bfz/marine/index.htm

The naval archive in the Bibliothek für Zeitgeschichte in der Württembergischen Landesbibliothek holds an extensive collection of photographs of U-boats from both World Wars.

uboat.net

U-boat net is probably the most extensive web archive of everything and anything related to U-boats.

www.gwpda.org/naval/lcastl10.htm

This webpage has extensive information on the sinking of the Llandovery Castle.

www.navweaps.com

www.juergenthuro.de/html/8_8_wki.html

Information on the guns on U-86 was extracted from these two webpages.