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  1. 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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  3. 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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  4. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Moonless Night

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Moonless Night

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  5. Mr. Keen, Tracer of Lost Persons 1951 The Strange Murder of Carrie Ellis

    Mr. Keen, Tracer of Lost Persons 1951 The Strange Murder of Carrie Ellis

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  6. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Strange Display

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Strange Display

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  7. 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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  8. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Woman in Blue

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Woman in Blue

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  9. 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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  10. 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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  11. 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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  12. 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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  13. 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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  14. Mr. Keen, Tracer of Lost Persons 1944-The Case of the Leaping Dog

    Mr. Keen, Tracer of Lost Persons 1944-The Case of the Leaping Dog

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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 1944-The Case of Mr. Trevor's Secret

    Mr. Keen, Tracer of Lost Persons 1944-The Case of Mr. Trevor's Secret

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  17. 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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  18. 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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  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 Case of the Absent Minded Professor

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

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  23. 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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  24. 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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  25. 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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