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• Benjamin Franklin to John Ingenhousz 16-Jan-1784
  .... And, in more detail, the balloon of [[Jacques Charles]] and the [[Frères Roberts]]. The latter, he writes, required a large amount of inflammable air ([[hyd
  2 KB (356 words) - 10:48, 14 December 2017
• Benjamin Franklin to Joseph Banks 1-Dec-1783
  Recounts the ascent of the [[Frères Roberts]] and [[Jacques Charles]] anticipated in [[Benjamin Franklin to Joseph Bank
  2 KB (235 words) - 18:08, 12 July 2018
• Benjamin Franklin to Joseph Banks 22-Nov-1783
  He anticipates in a few days another balloon launch, this one by the [[Frères Roberts]] along with [[Jacques Charles]], in a 26'-diameter balloon said to cost (w
  3 KB (489 words) - 10:12, 7 September 2023