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O'Dell, C. R. Nebula // World Book at NASA. World Book, Inc. Архивиран от оригинала на 2005-04-29. Посетен на 18 май 2009.
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O'Dell, C. R. Nebula // World Book at NASA. World Book, Inc. Архивиран от оригинала на 2005-04-29. Посетен на 18 май 2009.