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The Secret of Shark Reef (Alfred Hitchcock and the Three Investigators #30) by Alfred Hitchcock |
The Mystery of the Kidnapped Whale (Three Investigators Series No. 35) by Robert Arthur |
Alfred Hitchcock and the Three Investigators in the Mystery of the Moaning Cave, #10 by William Arden |
The Mystery of the Wandering Caveman (Three Investigators, No. 34) by Mary V. Carey |
The Mystery Of The Trail Of Terror by M. V.. Carey |

