Motor Girls in the Mountains; or, the Gypsy Girl's SecretMargaret Penrose · First published 1917Open the Tome
Motor Girls on Waters Blue; or, the Strange Cruise of the TartarMargaret Penrose · First published 1915Open the Tome
The Motor Girls on Crystal Bay or The Secret of the Red OarMargaret Penrose · First published 1914Open the Tome
The Motor Girls on the Coast or The Waif From the SeaMargaret Penrose · First published 1913Open the Tome
Motor Girls on Cedar Lake; or, the Hermit of Fern IslandMargaret Penrose · First published 1912Open the Tome
Motor Girls at Lookout Beach; or, in Quest of the RunawaysMargaret Penrose · First published 1911AdventureOpen the Tome
Motor Girls Through New England; or, Held by the GypsiesMargaret Penrose · First published 1911Open the Tome
