The ISBN system was devised beginning in 1967, and books published prior to then don't have "editions" associated with them. It's very similar with movie, music and video game UPCs. It's also possible that a seller listed an item with us and didn't include an ISBN/UPC with the listing. You'll find items like this by clicking this link.
The beguiling little monkey is featured in four books in this boxed set: "Curious George and the Bunny, Curious George and the Rocket, Curious George ...Show synopsisThe beguiling little monkey is featured in four books in this boxed set: "Curious George and the Bunny, Curious George and the Rocket, Curious George Goes Fishing" and "Curious George Rides". Includes a sturdy, reusable, carry-along box. Full color.Hide synopsis
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