Subject
4 free books about flight, free to read online. Chapter 1 of any book is free, no account needed.
Langley Memoir on Mechanical Flight, Parts I and II Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911
Langley, S. P. (Samuel Pierpont); Manly, Charles M.
Artificial and Natural Flight
Hiram S. Maxim
Birds in Flight
W. P. Pycraft
Der Vogelflug als Grundlage der Fliegekunst Ein Beitrag zur Systematik der Flugtechnik
Otto Lilienthal
