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216 pages, Hardcover
First published January 1, 1968
The Telltale TransmitterThese vary in quality, but on the average they are not, in my opinion, as good as those in the first book. I enjoyed the first, "The Telltale Transmitter" quite a lot, but the rest seemed to be straining too hard to be zany and quirky, to the extent of occasionally betraying the boys' characters.
The Cool Cavern
Big Chief Rainmaker
The Flying Sorcerer
The Great Confrontation