The Flying Machine Boys on Duty; Or, The Clue Above the Clouds

The Project Gutenberg eBook, The Flying Machine Boys on Duty, by Frank Walton
Descending from his seat, the aviator was greeted by two boys not far from his own age. The Flying Machine Boys on Duty. Page 4.
The Clue Above the Clouds
By FRANK WALTON
AUTHOR OF
“The Flying Machine Boys on Secret Service”
“The Flying Machine Boys in the Wilds”
“The Flying Machine Boys in Mexico”
A. L. BURT COMPANY
NEW YORK.
Copyright 1913
By A. L. Burt Company