Aeronautics.
Ledeboer, John Henry,1883-ed.
London : Aeronautics Office,
1907-1921.
Title from cover.
Founded by: John H. Ledeboer.
No numbers issued Jan.-Mar. 1911, Dec. 1914-Apr. 1915, inclusive.
May 1911-July 1921 called "New series".
Vol. 21 consists of 4 numbers only, issued in July 1921.
Vol. 1 was issued as a supplement to Knowledge.
Knowledge