[en] [Gutenberg 52025] • Motor Matt's Make-and-Break; or, Advancing the Spark of Friendship Createspace Independent Publishing Platform
[en] [Gutenberg 52397] • Motor Matt's Short Circuit; or, The Mahout's Vow Createspace Independent Publishing Platform
[en] [Gutenberg 10936] • The Girl Aviators' Motor Butterfly Tutis Digital Pub
[en] [Gutenberg 38739] • The Wright Brothers' Engines and Their Design Independently Published
[en] [Gutenberg 31023] • The First Airplane Diesel Engine: Packard Model DR-980 of 1928 Public Domain Books
[en] [Gutenberg 45825] • The Aeroplane Theclassics.Us
[en] [Gutenberg 1445] • Aeroplanes Createspace
[en] [Gutenberg 42018] • Natural Stability and the Parachute Principle in Aeroplanes Forgotten Books