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file G (Stack)Hackmann, W. D.; Anonymous
"Historical Note: Mackenzie's Early Polygraph Instrument"
photocopy from Polygraph (American Polygraph Association, Severna Park, Maryland), vol. 21 no. 4, 1992, pp. 349-351. (Re. Mackenzie polygraph c.1910 in MHS).
[1995-4]
1992