Chicago [Illustration: The Famous AIRSHIP BOYS SERIES] _By_ H.L.

SAYLER _SEVEN TITLES_ 1.

THE AIRSHIP BOYS Or, The Quest of the Aztec Treasure 2.

THE AIRSHIP BOYS ADRIFT Or, Saved by an Aeroplane 3.

THE AIRSHIP BOYS DUE NORTH Or, By Balloon to the Pole 4.