Molly's copy of Hey! Hey! Little Ship!
Hey! Hey! Little Ship! is a 24th century children's book, one in a series of "Rio and Buzz adventures."
The two primary characters are Rio and Buzz, anthropomorphized Starfleet spacecraft: Rio being a runabout, the Rio Grande, and Buzz is a Starfleet Corps of Engineers Work Bee, both are featured on the cover of the book.
Molly O'Brien had Hey! Hey! Little Ship! in her bedroom aboard Deep Space 9 in 2376. (DS9: "Time's Orphan")
The cover is barely visible for a few frames in the episode, though it is identified in the Star Trek: Deep Space Nine Companion.