Frontier Boys in the Grand Canyon; or, a Search for TreasureWyn Roosevelt · First published 2015AdventureOpen the Tome
Frontier Boys in the Sierras; or, the Lost MineRoosevelt, Wyn Capt · First published 1909Open the Tome
Frontier Boys in Colorado, or Captured by IndiansWyn Roosevelt, S. Schneider · First published 2014Open the Tome
Frontier Boys in Hawaii, or the Mystery of the Hollow MountainWyn Roosevelt, S. Schneider · First published 2014Open the Tome
Frontier Boys in Mexico, or Mystery MountainWyn Roosevelt, S. Schneider · First published 2014Open the Tome
Frontier Boys in the Rockies, or a Winter in the Big CanyonWyn Roosevelt · First published 2014Open the Tome
Frontier Boys in the SierrasS. SCHNEIDER, Zachary Reitan, Wyn Roosevelt · First published 2013Open the Tome
