Surveying Heinlein's juvenile novels, Jack Williamson noted that while Rocket Ship Galileo remains " readable, with Heinlein's familiar themes already emerging ," it was a " sometimes fumbling experiment.

Surveying Heinlein's juvenile novels, Jack Williamson characterized Space Cadet as " a long step forward.

Surveying Heinlein's juvenile novels, Jack Williamson characterized Between Planets as " mov the series still farther from its juvenile origins toward grownup concerns.

Surveying Heinlein's juvenile novels, Jack Williamson described Starman Jones as " a classic example of the bildungsroman pattern " and noted that " with its bold symbolism, the book makes a universal appeal.

Surveying Heinlein's juvenile novels, Jack Williamson noted that Farmer in the Sky " has harsh realism for a juvenile.

Surveying Heinlein's juvenile novels, Jack Williamson characterized Red Planet as Heinlein's first genuinely successful effort in the sequence, saying that " Heinlein found his true direction.

Surveying Heinlein's juvenile novels, Jack Williamson characterized Heinlein's story as " a dream of personal freedom " written with " an enviable craftsmanship ", noted that the novel " carries its thematic burden tightly ", unlike Heinlein's later adult novels, and praised The Rolling Stones for its " sense of an accurately extrapolated future background, with all of the new technologies given an air of commonplace reality ".

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