English: Illustration of the flight of a white stork by Otto Lilienthal in Der Vogelflug als Grundlage der Fliegekunst published in 1889. English translation published in 1911.
Date
Source
Der Vogelflug als Grundlage der Fliegekunst
Author
Otto Lilienthal (1848 – August 10, 1896)
Licensing
Public domainPublic domainfalsefalse
This work is in the public domain in its country of origin and other countries and areas where the
copyright term is the author's life plus 100 years or fewer.
You must also include a
United States public domain tag to indicate why this work is in the public domain in the United States.