1969/13: Gamera vs Guiron 1969

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https://en.wikipedia.org/wiki/Gamera_vs._Guiron 

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https://www.moriareviews.com/sciencefiction/attack-of-the-monsters-1969.htm 

http://1000misspenthours.com/reviews/reviewse-g/gameravsguiron.htm

https://fictionmachine.com/2021/11/23/review-gamera-vs-guiron-1969/