Hermann Krone (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hermann Krone" in English language version.

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iapp.de

Tobin, William (2021), Two Photograph Albums from the German Transit of Venus Expedition to the Auckland Islands in 1874, Journal of Astronomical History and Heritage 24(3), 823-861, retrieved 27 May 2022

Eder, Josef Maria (1881), Modern dry plates, or, Emulsion photography, New York, E. & H.T. Anthony & co, retrieved 31 October 2020