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The Land That Time Forgot is a science fiction novel, the first of Edgar Rice Burroughs' Caspak trilogy. His working title for the story was "The Lost U-Boat." Starting out as a harrowing wartime sea adventure, the story ultimately develops into that of a fantastical lost world. (Adapted from Wikipedia.)
Link to _The People that Time Forgot_ (Caspak series #2)
Link to _Out of Time’s Abyss_ (Caspak series #3)