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Kahn, David. The Codebreakers. New York: Macmillan, 1967.
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Laffin, John. Codes and Ciphers. New York: Abelard-Schuman, 1964.
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Lunde, Donald Т., M.D. Murder and Madness. New York: W. W. Norton & Co., 1979.
Murder and Madness.
Oken, Alan. As Above, So Below. New York.
As Above, So Below.
Pratt, Fletcher. Secret and Urgent. New York.
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Sest, Mann, Flangan, Cowen. The Phenomenon Book of Calendars. New York: Simon & Schuster, 1978.
The Phenomenon Book of Calendars.
Snyder, LeMoyne. Homicide Investigation. Springfield, Illinois: Charles C. Thomas Co., 1977.
Homicide Investigation.