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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 1, Folder 70"
Luftfahrt des Herrn Professors Bourguet, zu Berlin den 23 May Ao 1804 [Etching of Professor Bourguet]
![Luftfahrt des Herrn Professors Bourguet, zu Berlin den 23 May Ao 1804 [Etching of Professor Bourguet]](https://digitalcollections.museumofflight.org/files/square_thumbnails/82dd29e9c71ad2147172ceee23af8d24.jpg "Luftfahrt des Herrn Professors Bourguet, zu Berlin den 23 May Ao 1804 [Etching of Professor Bourguet]")
Etching of a bust portrait in profile of Professor Bourguet surrounded by ballooning items, original artwork dated 1804. Depicted items include barrels of gas, books, a compass, a balloon, and a parachute.Inscription in German below image: "Luftfahrt…