Eagles of the Sky / With Jack Ralston Along the Air Lanes

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

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

Flying the Coast Skyways. Jack Ralston's Swift Patrol

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

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