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French). Archived from the original on 7 November 2006. Retrieved 18 July 2019. Marius Dewilde at Ufologie.net, with photos of the incident (in French)...
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volumes of her father's unpublished work. "UFOs A-Z. Ziegel, Felix". www.ufologie.net. Retrieved 13 October 2010. "Ф. Ю. Зигель". Encyclopedia of the Unknown...
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