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  1. Mr. Keen, Tracer of Lost Persons 1951 The Poisoned Sandwich Murder Case

    Mr. Keen, Tracer of Lost Persons 1951 The Poisoned Sandwich Murder Case

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  2. Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder at a Mile a Minute

    Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder at a Mile a Minute

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  3. Mr. Keen, Tracer of Lost Persons 1950 The Case of the Melody of Murder

    Mr. Keen, Tracer of Lost Persons 1950 The Case of the Melody of Murder

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  4. Mr. Keen, Tracer of Lost Persons 1952 The Case of Murder and the Prize-Winning Bull

    Mr. Keen, Tracer of Lost Persons 1952 The Case of Murder and the Prize-Winning Bull

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  5. Mr. Keen, Tracer of Lost Persons 1944-The Case of Murder in the Air

    Mr. Keen, Tracer of Lost Persons 1944-The Case of Murder in the Air

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  6. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Bloodstained Necklace

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Bloodstained Necklace

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  7. Mr. Keen, Tracer of Lost Persons 1950 The Eccentric Millionaire Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Eccentric Millionaire Murder Case

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  8. Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Forgotten Cave Murder Case

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  9. Mr. Keen, Tracer of Lost Persons 1951 The Airport Murder Case

    Mr. Keen, Tracer of Lost Persons 1951 The Airport Murder Case

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  10. Mr. Keen, Tracer of Lost Persons 1950 The Skull and Crossbones Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Skull and Crossbones Murder Case

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  11. Mr. Keen, Tracer of Lost Persons 1952 The Silver Candlestick Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Silver Candlestick Murder Case

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  12. Mr. Keen, Tracer of Lost Persons 1950 The Quicksand Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Quicksand Murder Case

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  13. Mr. Keen, Tracer of Lost Persons 1950 The Bride and Groom Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Bride and Groom Murder Case

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  14. Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Missing Car

    Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Missing Car

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  15. Mr. Keen, Tracer of Lost Persons 1954 The Shrieking Prisoner Murder Case

    Mr. Keen, Tracer of Lost Persons 1954 The Shrieking Prisoner Murder Case

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  16. Mr. Keen, Tracer of Lost Persons 1952 The Mother's Plea Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Mother's Plea Murder Case

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  17. Mr. Keen, Tracer of Lost Persons 1950 The Telephone Book Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Telephone Book Murder Case

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  18. Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Jewel Thief

    Mr. Keen, Tracer of Lost Persons 1950 The Case of Murder and the Jewel Thief

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  19. Mr. Keen, Tracer of Lost Persons 1950 The Innocent Flirtation Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Innocent Flirtation Murder Case

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  20. Mr. Keen, Tracer of Lost Persons 1950 The Case of the Rushville Murder

    Mr. Keen, Tracer of Lost Persons 1950 The Case of the Rushville Murder

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  21. Mr. Keen, Tracer of Lost Persons 1952 The Rented Cottage Murder Case

    Mr. Keen, Tracer of Lost Persons 1952 The Rented Cottage Murder Case

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  22. Mr. Keen, Tracer of Lost Persons 1944-The Nightmare Murder Case

    Mr. Keen, Tracer of Lost Persons 1944-The Nightmare Murder Case

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  23. Mr. Keen, Tracer of Lost Persons 1950 The Broken Window Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The Broken Window Murder Case

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  24. Mr. Keen, Tracer of Lost Persons 1950 The King Cobra Murder Case

    Mr. Keen, Tracer of Lost Persons 1950 The King Cobra Murder Case

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  25. Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder and the Strange Woman

    Mr. Keen, Tracer of Lost Persons 1951 The Case of Murder and the Strange Woman

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