| William H. Mumler Mary Todd Lincoln with the spirit of Abraham Lincoln n.d. Carte de visite, type of photograph unclear College of Psychic Studies Accessed from the Internet. LL/61607 I'm indebted to Beverly Wilgus for locating this example (Facebook, "Victorian images" group, 4 October 2015)
This portrait has an unusually high contrast and this may have been done when Hudson copied the Mumler photograph. Clarification on the format is requested.
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