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Sketches of Men of Progress

出版	New York and Hartford publishing Company, 1871
URL	http://books.google.com.hk/books?id=JbBmqJwaKC0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋"57 steel engravings by various artists, many from photographs. 1 heliographic engraving from a photographic portrait of James W. Gerard. Half-tone by Frederick W. Von Egloffstein's Heliographic Engrav. & Print Co. 135 West 25th St., N.Y. It is interesting that out of 58 portraits only one would be done in a photomechanical process. Breaking new ground was probably not easy: entrenched notions of the proper way to do portrait engravings and possibly the cost prohibition of the new process kept people from trying it." -- Hanson Collection Catalogue, p. 37-38.