The River Motor Boat Boys on the Colorado; Or, The Clue in the Rocks

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 Ohio The Three Blue Lights

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