Links about The Battle of River Plate:
http://www.grafspee.com is a site focusing on the life of Captain Langsdorff.
http://www.nzhistory.net.nz/keyword/river-plate the New-Zealand history web site about the battle of River Plate. HMS Achilles was part of the New-Zealand Royal Navy, Royal Navy New Zealand will be created on 1941.
http://www.kbismarck.org/forum/viewtopic.php?f=14&t=6524
and
http://www.kbismarck.org/forum/viewtopic.php?f=9&t=6702
are two excellent threads on the Bismarck forum about the DKM Graf Spee and the battle of River Plate.
All About Games:
Links about Naval Warfare and Naval History:
http://www.navweaps.com An incredible reference about Naval Weapons and Technology.
http://www.kbismarck.org It is an excellent site about Naval History and the discussion board is hours of passionate debate.
http://www.german-navy.de Beyond very nice pictures of DKM Graf Spee there is a stunning 3D model.
Links about Naval Wargaming:
http://amiraute-news.com (In French) An excellent website about Amirauté the “Grand Dad of French Naval Wargaming”. There is a PDF of an updated set of those French miniatures rules.
http://navalwargamessociety.org This very British Society is publishing “All Gun Blazing” and is providing information about all Naval Wargaming Events.