Secret service -- United States -- Juvenile fiction books

Wings Over the Rockies; Or, Jack Ralston's New Cloud Chaser

Ambrose Newcomb

Eagles of the Sky; Or, With Jack Ralston Along the Air Lanes

Ambrose Newcomb

Trackers of the Fog Pack; Or, Jack Ralston Flying Blind

Ambrose Newcomb

The Young Wireless Operator—With the U. S. Secret Service Winning his way in the Secret Service

Lewis E. Theiss

Flying the Coast Skyways; Or, Jack Ralston's Swift Patrol

Ambrose Newcomb

The Sky Detectives; Or, How Jack Ralston Got His Man

Ambrose Newcomb

The Sky Pilot's Great Chase; Or, Jack Ralston's Dead Stick Landing

Ambrose Newcomb