Has the experiment failed? Why hasn't doc Tom returned through the time tunnel? 'He's hours overdue,' says Bob grimly. 'Where is he?' 'Back 80 million years in time,' says Dr. Miller. 'Back in the age of the dinosaurs.' What has gone wrong? Is it too late to save Pete's father? There is only one way to find out. Pete and Bob must go through the time tunnel.
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Used availability for Lester del Rey's Tunnel Through Time
May 1960 : USA Hardback
June 1970 : USA Paperback
December 2014 : USA, Canada, UK Kindle edition