I have a short bio of Stephens online that mentions his previous association with Fiske and Gould as well as some others who may be featured: http://www.twainquotes.com/UniformEds/UniformEdsCh26.html Stephens also produced THE COMIC NATURAL HISTORY OF THE HUMAN RACE. The book also presents a challenge to identify the heads. A scribbled note on the end papers looks like others have attempted to identify characters in this work: https://archive.org/details/comicnaturalhist00steprich/page/n1 Barb