"Flotter and the Perfect Day" was a late 24th century children's book in The Adventures of Flotter series. A copy of this book was stored on a PADD aboard the USS Voyager.

The book had at least five chapters, and was available both in text and audio. The book began with an attack by a fleet of alien ships on four natural wonders: the Grand Canyon, Monument Valley, Yellowstone National Park, and Yosemite National Park, all in the western United States on Earth. (VOY: "Lineage")

The text ended abruptly with the suggestion that the aliens were hunting for something amid the rubble of the destroyed regions.
According to the text description for the PADD, this story appears in several episodes of Star Trek: Voyager. [1]
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