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W. & F. Langenheim
The Smithsonian "Castle"
1850, June/July
Lantern slide photograph on glass in wood mount
Smithsonian Castle Collection
Gift of Tom Rall, Arlington, Virginia.
LL/60638
Alex di Giovanni, 10 August 2015, "Deconstructing a Mystery: Rare photo proves to be the earliest ever taken of the Smithsonian Castle", The Bigger Picture, Smithson Institution Archives
(Accessed: 10 August 2015)
siarchives.si.edu/blog/deconstructing-mystery-rare-photo-proves-be-earliest-ever-taken-smithsonian-castle
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LuminousLint 
@LuminousLint