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http://www.vgmuseum.com/ - Video Game Museum - Some of the Gradius ending sequences for Various console and lots more
https://www.angelfire.com/anime3/twinbee/index.html - TwinBee Land - Excellent site with loads of information (NOT UPDATED since 22nd August 2001)
http://bifi.msxnet.org/msxnet/konami/ - Konami MSX Games - Great place for information on all the Konami MSX games
(All translations are in English and done with AltaVista Babel Fish and Google)
https://www.konami.com/games/jp/ja/ - KONAMI Japan - For all your gaming information (Japanese)
https://bhdaa.sakura.ne.jp/gradius/ - Gradius World - Translated to English
https://bhdaa.sakura.ne.jp/parodius/ - Strategy Parodius - Translated to English
https://bhdaa.sakura.ne.jp/twinbee/ - TwinBee World - Translated to English
https://ht-deko.com/gradius/gradius.html - GRADIUS Corner - Information about the Gradius Series - Translated to English
http://www.linkclub.or.jp/~kis/GT_main.html - Gradius Triangle - Nice art plus a BBS - Translated to English
https://castlevaniadungeon.net/ - The excellent site dedicated to one of Konami's sister series Dracula.
https://www.mameworld.info/ - Great site for hi-res arcade scans for use with MAME.