Portrait of Matthew B. Brady Unknown  (American)

Price’s patened Process

Hanson, David A. "The Beginnings of Photographic Reproduction in the Usa." History of Photography. 12.4 (1988): 357-376. figure 17
Rosenblum, Naomi. A World History of Photography. New York: Abbeville Press, 1998 (alt)
Hanson, David A. Checklist of Photomechanical Processes and Printing, 1825-1910. , 2017. p. 105.