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  1. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Boy Who Used Big Words

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Boy Who Used Big Words

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  2. 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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  5. Mr. Keen, Tracer of Lost Persons 1945-The Case of the Absent Minded Professor

    Mr. Keen, Tracer of Lost Persons 1945-The Case of the Absent Minded Professor

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  6. Mr. Keen, Tracer of Lost Persons 1949 The Yellow Talon Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Yellow Talon Murder Case

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  7. Mr. Keen, Tracer of Lost Persons 1949 The Engaged Girl Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Engaged Girl Murder Case

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  8. Mr. Keen, Tracer of Lost Persons 1949 The Case of the Ruthless Murderers

    Mr. Keen, Tracer of Lost Persons 1949 The Case of the Ruthless Murderers

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  9. Mr. Keen, Tracer of Lost Persons 1949 The Case of the Man Who Invented Death

    Mr. Keen, Tracer of Lost Persons 1949 The Case of the Man Who Invented Death

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  10. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder with a Thousand Witnesses

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder with a Thousand Witnesses

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  11. Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Star of Death

    Mr. Keen, Tracer of Lost Persons 1949 The Case of Murder and the Star of Death

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  12. Mr. Keen, Tracer of Lost Persons 1946-The Case of the Glamorous Widow

    Mr. Keen, Tracer of Lost Persons 1946-The Case of the Glamorous Widow

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  13. 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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  14. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Missing Witness

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Missing Witness

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  15. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Sang Too Well

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Sang Too Well

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  16. 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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  17. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Flirted

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Girl Who Flirted

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  18. 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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  19. 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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  20. Mr. Keen, Tracer of Lost Persons 1949 The Silver Dagger Murder Case

    Mr. Keen, Tracer of Lost Persons 1949 The Silver Dagger Murder Case

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  21. Mr. Keen, Tracer of Lost Persons 1950 The Case of the Murdered Detective

    Mr. Keen, Tracer of Lost Persons 1950 The Case of the Murdered Detective

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  22. Mr. Keen, Tracer of Lost Persons 1945-The Strange Case of Charley Lorimer

    Mr. Keen, Tracer of Lost Persons 1945-The Strange Case of Charley Lorimer

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  23. 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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  24. 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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  25. 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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