| || |
W. & F. Langenheim
The Smithsonian "Castle"
Lantern slide photograph on glass in wood mount
Smithsonian Castle Collection
Gift of Tom Rall, Arlington, Virginia.
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)