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cotton-thief
specter spy, or, The wizard canoe
specter spy, or, The wizard canoe
Twenty boy spies, or, The secret band of Dismal Hollow
The brand of Siberia, or, The boy tracker of the Steppes
The blue mask, or, Fighting against the Czar
The iron grays, or, The boy riders of the Rapidan
The spy of Spuyten Duyvil, or, The boy with a charmed life
Loyal to the last, or, Fighting for the Stars and Stripes
Young Jack Harkaway in the wilds of Siberia
The boy in red, or, The czar's masked messenger
Jack Harkaway and the spy
Jack Harkaway trapped
unsolved mystery, or, Nick Carter's government case