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4-6Mysteries of History series.
Theories surrounding Nevada's Area 51 as well as reports of unexplained phenomena and unconfirmed events (mainly UFO sightings) are laid out for readers in clear, concise text with plenty of images. With frequent inserts (and an appendix) of comprehension activities, publisher's links, and writing prompts, the series is more focused on core standards than general research. Reading list. Glos., ind.