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William Notman [Attributed to]
A stereocard within a stereocard
n.d.
Stereocard
Stereoviews: Stereoviews and Fine 19th & 20th Century Antique Photographs
LL/57576
This stereocard shows another stereocard and in that stereocard the people are looking at stereoviews.
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LuminousLint 
@LuminousLint