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Clyde W. Tombaugh Clyde, Wisconsin Clyde, Ohio Clyde, Kansas Clyde, Texas Clyde, Quận Whiteside, Illinois Clypeomorus Clytemnestra Clypeomorus batillariaeformis CléderTài liệu tham khảo
WikiPedia: Clyde W. Tombaugh http://www.roswellproof.com/ramey_and_ufos.html http://www.astro.uni-bonn.de/~pbrosche/persons/per... http://www.ilga.gov/legislation/96/SR/PDF/09600SR0... http://www.scientificexploration.org/jse/articles/... http://www.ufo.se/ufofiles/issue_4/astro_uk.html https://commons.wikimedia.org/wiki/Category:Clyde_...