Actually Brouchard came from a French bakery. But seriously, E-bay has recently had a couple of contemporary articles about the flight for sale. I would suggest that you do a search (including description) weekly for Blanchard Jeffries.
I'll bet you get a lot of stuff shortly.
There was an airmail cover that was carried on the first crossing of the English channel by hot air balloon, too. It wasn't either Blanchard or the baker.
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