Secrets of Modern Spying. By "Vigilant."
French War Birds ; Vigilant [Pseud. ; Heldentaten franz. Flieger im Weltkriege].
Lynx, V.C., Flies Again. By Vigilant
Fighting the Red Shadow
Lynx V.C., Flies Again
Lynx Counter-spy
Richthofen, the Red Knight of the Air. [A Biography]
French War Birds. [An Account of French Airmen During the Great War. With Portraits.].
Der Kulturkampf in Frankreich, geschichtliche Darstellung und kritische Würdigung, von Vigilant
Richthofen, the Red Knight of the Air. [With Portraits.].
The Occurrence of the Harmful Algae Bloom Toxin, Domoic Acid, in Nearshore and Offshore Benthic Communities of Monterey Bay, California
Fighting the Red Shadow