The River Motor Boat Boys on the Ohio; Or, The Three Blue Lights

The Six River Motor Boat Boys on the St. Lawrence; Or, The Lost Channel

The River Motor Boat Boys on the Mississippi; Or, On the Trail to the Gulf

The River Motor Boat Boys on the Columbia The Confession of a Photograph

The River Motor Boat Boys on the Amazon The Secret of Cloud Island

The River Motor Boat Boys on the Colorado The Clue in the Rocks