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

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