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Hidden Valley of Oz
The Hidden Valley of Oz (1951) is the thirty-ninth of the Oz books created by L. Frank Baum and the only one written by Rachel Cosgrove. It was illustrated by Dirk Gringhuis.
Jam, a boy from Ohio builds a kite and attaches it to a crate and sets off to Oz with his two guinea pigs, Pinny and Gig and a lab rat named Percy. Once in Oz, Jam realizes his pets can talk. He lands in the Hidden Valley, and becomes a prisoner, but they escape and set out on adventures with the Tin Woodman.