"A 
          Correct Likeness of Dr. Parkman. As Last Seen Previous to the Murder." 
          Engraving, 1850.
          Published in Trial of Professor John W. Webster, for the Murder of 
          Doctor George Parkman. 
          Reported Exclusively for the N.Y. Daily Globe (New York: Stringer 
          and Townsend, 1850), p. 76.