From Inventing aviation
- Christopher Hatton Turnor. Astra Castra: Experiments and Adventures in the Amosphere. London: Chapman and Hall, 193 Piccadilly. 1865.
Online at Internet Archive.
A history of aeronautics focused mostly on Montgolfiers through time of writing.
Astra Castra = [the] stars [my] camp. From "Astra Castra Numen Lumen", motto of the Lindsays, Earls of Crawford.
- Joseph Jackson, "The First Balloon Hoax", Pennsylvania Magazine of History and Biography, 1911.
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